'Polyoptrum' definitions:

Definition of 'Polyoptrum'

From: GCIDE

Polyoptron \Pol`y*op"tron\, Polyoptrum \Pol`y*op"trum\, n. [NL., from Gr. poly`s many + ? seen.] (Opt.) A glass through which objects appear multiplied, but diminished in size. [R.] [1913 Webster]