catopter

== English == === Etymology === Ancient Greek κάτοπτρον (kátoptron, “mirror”). === Noun === catopter (plural catopters) (obsolete) A reflecting optical glass or instrument; a mirror. 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. An Ancient Greek anal dilator or speculum. ==== Synonyms ==== catoptron === Anagrams === attercop, capretto