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Doors often have a small hole with a fish-eye lens for security purposes. They are commonly called 'peepholes' but I'm sure I have come across a formal architectural term for this type of aperture, possibly Latin or Greek. I can't find it though!

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    Apparently door viewer is the "official" term, though I'm not sure how many people would know what it means. – Hot Licks May 18 '15 at 12:37
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    Since the ancient Romans and Greeks didn't have fish-eye lenses, it seems unlikely they'd have have a word for the modern type of door viewer that depends on them. – FumbleFingers May 18 '15 at 12:42
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    Peephole: opening, crack, hole, aperture, knothole, crevice, eyehole, eyelet, slit, slot, spyhole. – user66974 May 18 '15 at 12:47
  • Not necessarily with a lens, just the hole itself. – Alan B May 18 '15 at 13:03
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    I'm a technical writer in the construction industry and have seen 'peephole' used in many official/formal documents (UK). – Jascol May 18 '15 at 13:18
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We had one on the door when I was growing up in the 1960s London and we called it the Vassi. Just checked with my sister and she remembers the same word. Never knew why until I read Hans Adler comment. It was clearly a corruption of vasistas. It was my Grandmother's word as it was her house.

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    I see this answer was "accepted" but it doesn't appear to answer the question, which is asking for the formal term for these holes. – Mark Beadles Aug 19 '17 at 13:32
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    Note for authors: destructive edits should not be accepted. An edit stating "this is wrong" should have been another answer; if you feel it's justified you can write the other answer. – Andrew Leach Jun 2 '19 at 11:35
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I'm fine about being wrong but will add I was referring to an opening in the door which Gran called a Vassi. It was a small window that could be opened from the inside to allow delivery of small packages. I think I may have misunderstood the original question.

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