# catopter

> English word · Noun

## Definitions
1. A reflecting optical glass or instrument; a mirror.
2. A unit of measure of the converging power of a curved mirror, equal to the reciprocal of the focal length in meters; a diopter applied to a curved reflective surface as opposed to a lens.
3. An Ancient Greek anal dilator or speculum.

## Etymology
Ancient Greek κάτοπτρον (kátoptron, “mirror”).

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/catopter