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Is there a synonym for open other than dilate that describes the process of spreading open from a central point?

For example, when fire burns a hole in a piece of paper what would the paper be said to be doing? Or when a whirlpool begins to form, is there a word that describes the process of the water being drawn apart? And also what about the action of a camera shutter?

For all of these examples open would technically suffice because readers already have a grasp of these objects' mechanisms and there is no need for further explanation. But if I am trying to describe something new with which the reader has no previous familiarity, such as a futuristic machine, then open no longer adequately conveys my meaning without additional qualifying words or descriptions. We are used to opening things such as doors or boxes or drawers that involve either a hinge mechanism or some variation of two usually linear objects drawing apart from each other, and if I use this word I feel that I will have to struggle against these connotations.

Dilate perfectly captures what I am trying to describe but I do not want to use it because it is traditionally restricted to the action of an eye's pupil or some other sphincter and therefore may not come across well with readers.

I understand that there may be no other single word for this action but I wanted to put the question out there in case some rare or obscure word does exist.

Note: I prefer a single word substitute, but I am not opposed to suggestions of words that may be paired with open, such as spread or draw.

Example sentences:

So far there are two instances in a novel I am writing where I have needed a word to describe this motion. One example involves a wall opening, and the other involves a window opening. In both cases only a portion of the wall or window "retract" into themselves to create a hole or opening, and this without any noticeable bunching resulting around the edges.

  1. Up ahead the right wall ______ into an archway and Madeline hurried through.

  2. She was surprised when the glass ______ around her fingers, exposing them to the rain.

Edit:

It is a futuristic story where the walls and even windows are constructed from intricate biological machines which permit them to morph into various shapes seamlessly. But it is not the mechanism that I wish to describe, it is the motion, which is why I thought it unnecessary to digress into the mechanical minutiae. Dilate describes the motion.

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    Widen, expand, or radiate. – Yosef Baskin Feb 2 '17 at 21:24
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    I'm pretty sure dilating isn't just restricted to body parts. Do you have any sources for that claim? – Nic Hartley Feb 2 '17 at 22:09
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    I may end up using dilate, I'm merely hesitant to do so. – Peter Feb 2 '17 at 22:14
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    Is the thing actually dilating open? That is, do parts of it stretch or slide smoothly so that a disc turns into a flat ring? Just how obscure are you willing to go? Depending on your specific usage, some possibilities might include spread, gape, blossom, retract, unconstrict, uncinch, dehisce, patulicate. – 1006a Feb 2 '17 at 23:39
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    A hole burning in a piece of paper widens, a whirlpool cavitates, and camera shutter irises. – Gnawme Feb 3 '17 at 2:52
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In case if you haven't realised it already, finding single words to accurately describe a specific situation is very hard and many a time, impossible. Why not just be a little more descriptive? Say what you want to say. The situation you have in mind doesn't necessarily have to be expressed by a single word.

  • Up ahead it seemed as if the walls on both sides were being hammered and bended and thinned out. The whole place metamorphosed into an archway, while Madeline hurried through.
  • She ran her fingers over the misty window. To her surprise, the glass gave way to her fingers and they passed through, exposing them to the rain. She stared in wonder at the glass as it spread out round her fingers.

  • The moment her finger touched the glass, a tiny hole formed at the spot, no bigger than a pinhead. As she went deeper into the glass, the hole kept enlarging/expanding from that point until it fit her finger completely.

  • "... as it expanded (a)round her fingers..." is probably better. If the OP is looking for a synonym for "dilate", it seems he's more concerned with the process [action] of enlargement than with the end result. Oh, I could be wrong! – Mari-Lou A Jul 16 '17 at 6:05
  • @Mari-LouA Edited the answer – Soha Farhin Pine Jul 16 '17 at 6:51
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I still don't understand the example with the glass, but I will share some ideas about the first example.

First, let's focus on what's really going in dilation. In dilation, there is already a small opening, and when it dilates, it gets bigger. If you start with something that looks like a smooth wall, and it appears to morph into a doorway, then I don't think anything is actually dilating.

I will work from what you said about intricate biological machines which morph into various shapes seamlessly.

Morph would work, but I can see that you would prefer something more subtle. Shift would be nice, but I suspect that word has been a bit overused in the genre you're working in. So here are a few words in the target area:

  • reshape
  • convert
  • transform
  • recast
  • reform
  • transmute
  • part
  • spread

You can also use some slightly farther afield word such as

  • toggle
  • retune
  • permute

But Peter, I see no reason not to repurpose some even less related word to convey what you have in mind. You are creating a tangible world that is different from ours; you may also create a vocabulary as you go along. Some examples of this repurposing approach:

  • tune
  • swish
  • door (use as a verb, e.g. "the wall ahead doored into an archway")

The third and last way to go about it is to create a brand new word, for example (these are all verbs):

  • re-just (from adjust)
  • sesame (from Open, Sesame; past tense might be sesame'ed)
  • mod (past tense modded)
  • diff (from make different)

These last four examples are not particularly good -- they are just provided to free you up in your thinking.

  • I may have to adopt your second or third suggestion. – Peter Feb 4 '17 at 20:27
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    @Peter - Please let us know what you decide to use. // You could also say that an opening appeared and grew or expanded. – aparente001 Feb 5 '17 at 1:41
  • when I decide what to use where should I post it? Should I comment, edit my question, or post an answer? – Peter Feb 5 '17 at 5:34
  • Well, all of those are reasonable choices. The disadvantage of a comment is that it could disappear at any time -- although frankly I don't see much mod removing of comments happening on this particular site. If you decide to use something someone else suggested, or guided you towards, perhaps a new answer would not be ideal. However, when I ask a question on ELU and end up doing something totally different than what others suggested, I do post my own answer, and then I accept it. So far no one has been bothered by my doing that. – aparente001 Feb 5 '17 at 20:02
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For your first example, I would use dilate - I've seen it used in examples for doors before, especially in science fiction. Do a Google search for the phrase and you'll see it is not only used, it's a canonical example from Heinlein about evoking the future simply.

For your second example, I think I'd use something that would emphasize the motion of the glass away from the fingers (a motion which is not necessarily strictly circular), like "withdrew". That seems to capture the inherent and presumably intentional creepiness of the motion under the hand.

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You might use divaricate, which means

  • to spread apart
  • to diverge widely

"divaricate one's fingers"

It's also used in botanical sense as to diverge at a wide angle; to branch off; forked. It describes the motion of not only spreading but separating too. The particles of the door/glass separately diverging (or branching off) to morph into an archway.

  1. [...] the wall divaricated (branching/spreading widely from a point) into an archway and Madeline hurried through.
  2. [...] when the glass divaricated (separates and spreads) around her fingers, exposing them to rain.'

On a technical note, also consider

centrifugal

proceeding or acting in a direction away from a center or axis.

It's verb is

centrifugate

to drive out centrifugally

"the wall centrifugates into an archway"

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I did not decide to use isises, however, I do believe it is the best synonym for dilates and wish to give credit to Gnawme who mentioned it first.

aparente001's answer was helpful in freeing up my creativity and I considered using metamorphose because of his suggestion of the words transform and reshape. I also considered inventing the following because of the final suggestion aparente001 offered in his answer:

  1. intraverse: intra "within" verse "to turn"
  2. intracede: intra "within" cede "to go"
  3. intravene: intra "within" vene "to come"
  4. intragress: intra "within" gress "to go/walk"

I discarded the idea of using these however, both because 2 and 3 sound like the preexisting intercede and intervene, and because retract mentioned by 1006a and recede mentioned by htmlcoderexe already exist and may be used to convey the same thing.

I was considering these last two for a moment but I finally decided on withdraw for the door example. I came to this decision before I saw Mark Thompson's comment, but I would still like to give him credit for mentioning it.

The first sentence therefore ended up like this:

Up ahead the right wall withdrew itself into an archway and Madeline hurried through.

For the second sentence I decided to go another direction entirely. Here it is with additional sentences for full effect:

Against Madeline's skin the window thinned permitting her to feel more tangibly the vibrations of the rain. She was surprised, however, when the glass became permeable to her fingers, yielding and moulding around them so that they entered exposed into the rain. She wiggled her fingers. The glass offered no resistance but displaced around them freely.

I felt that became permeable accurately captured what I was trying to express because in the same way that a membrane may be selectively permeable to liquids and gases the window is selectively permitting Madeline's hand to pass through it. And with the additional descriptions of yeild, mould, and freely displace I was satisfied that the idea would be adequately conveyed.

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