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In a square room in a house, what is the word for the corner where one of the walls meets the ceiling?

I kept thinking it was a word like "eaves", but that turned out to be the overhang. I have googled a few things, but most of it is irrelevant about topics like mold.


Edit, for clarity:

In math, two distinct planes may intersect on a line, and 3 distinct planes may intersect at a point. Lines segments between two points are sometimes called edges.

I said "square room", but what technically meant was "cube room".

I said "corner where one of the walls meet the ceiling" because I was thinking of the phrase, "Stand with his nose in the corner." I've heard the word "corner" refer to BOTH the line of intersection between two planes AND the point of intersection between 3 planes, when people talk about rooms. As in, "Painting yourself into a corner."

I should have used the word "edge", because I've only heard "edge" referred to as the LINE of intersection between two planes. I think of "edge" as a more specialized word, for someone doing graph theory or geometry. "Edge" would have been a much better word to use in asking because of the reduced ambiguity.

To be most clear, the reason I accepted the answer is because of the word crown. Crown can be used to distinguish the difference between the edges where the walls meet the ceiling vs where the walls meet the floor.

I'm sorry for the confusion.

  • What's wrong with "corner"? A/The corner of the ceiling sounds perfectly fine to me. – Mari-Lou A Dec 23 '17 at 8:18
  • I was looking for a word to distinguish between the upper corners and the lower corners. – r12 Dec 23 '17 at 14:41
  • if you could explain why you need this specific term it would help. – Mari-Lou A Dec 23 '17 at 14:50
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    Look, overhang is on the outside of a house. Eaves are in attics. One wall does not meet a ceiling "in a corner". Typically, the corners of a room can be at the ceiling or on the floor. A corner is formed by two walls, either at the top or the bottom. I think you are mixing up the word corner and edges, in a Romance language. Crown molding is decorative. Do you mean: the edge, where the edge of one wall meets the ceiling? That is called the ceiling line or where the wall meets the ceiling. – Lambie Dec 27 '17 at 1:23
  • Please show us an image of what you mean. – tchrist Dec 27 '17 at 16:09
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The terms ceiling line and floor line are used for the lines where the wall meets the ceiling and the floor, respectively. For example, the terms are used in the book Architectural Drafting for Interior Designers (by Lydia Sloan Cline):

enter image description here

To make it more clear, I drew this diagram in Paint:

enter image description here

You can use the term cove or coving for the concave arched molding at the junction of a wall with a ceiling.

The definition of coving from britannica.com:

Coving, in architecture, concave molding or arched section of wall surface. An example is the curved soffit connecting the top of an exterior wall to a projecting eave. The curve typically describes a quarter-circle. The arched sections of a curved ceiling would be coving. Such a coved ceiling serves to join the vertical walls with a flat ceiling.

The definition of cove from Architect's Illustrated Pocket Dictionary (by Nikolas Davies, Erkki Jokiniemi):

1 a curved underside or soffit

2 coving; a concave moulding of plaster, timber or plastics, fixed as a decorative covering at the meeting of ceiling and wall; any meeting of ceiling and wall treated in this way; a cove tile; see also cavetto.

enter image description here

Note: In North America, the term crown molding is used for the molding at the junction of an interior wall and ceiling.

  • No, I'm sorry, this is not right. Crown molding is a piece of wood glued or nailed into the top or near the top of a wall. This is most definitely not " the corner where one of the walls meets the ceiling" – Lambie Dec 27 '17 at 1:19
  • Your answer has nothing to do with the question. The lines of a wall and ceiling are just the lines where they meet. Molding or coving is not found on most walls. It is extra, decorative. The OP's question is not about this, I don't think. – Lambie Dec 27 '17 at 1:29
  • I understand what you are saying and I understand the question. What you posted is correct but I don't believe the OP actually meant that. I have the feeling the OP speaks French or Spanish and is now under the impression that where every wall meets a ceiling, there is molding. See what I mean?? – Lambie Dec 27 '17 at 1:34
  • @Lambie the word I needed was "crown", to distinguish the difference between the edges where the floors meet the walls against the edges where the walls meet the ceiling. Thanks for your help! These comments have helped me think about the issue quite a lot. – r12 Dec 27 '17 at 16:06
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    @r12 But that is where you are in error, if you will. The edges where the walls meet the ceiling are not called crowns. Believe it or not, there is no word for where the floor meets the wall and the walls meets the ceiling. Where the floor meets the wall, there is often trim or baseboard and where the floor meets the ceiling, there is molding (crown molding being one of them), But those are added to the place where they meet and are not the meeting of them. :) – Lambie Dec 27 '17 at 17:11
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The cornice area is where walls and ceilings join.

From Home Design Directory

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I'm a plasterer; it's called the arris (a junction where two flat surfaces meet).

arris
noun
ar·​ris | \ ˈa-rəs, ˈer-əs\
plural arris or arrises

the sharp edge or salient angle formed by the meeting of two surfaces especially in moldings

[Source: Merriam-Webster Dictionary]

And a more detailed explanation:

In architecture, an arris is the sharp edge formed by the intersection of two surfaces, such as the corner of a masonry unit; the edge of a timber in timber framing; the junction between two planes of plaster or any intersection of divergent architectural details. Also the raised edges which separate the flutings in a Doric column.

[Source: Wikipedia]

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    Hmmm. I think I'd only use the term arris for an external corner, not for an internal one. – AndyT Apr 5 at 11:34

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