catopter
/K AE1 T AA0 P T ER0/noun
- 1
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.
- 2
(obsolete) A reflecting optical glass or instrument; a mirror.
- 3
An Ancient Greek anal dilator or speculum.
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