Polyoptrum

1 definition found

From The Collaborative International Dictionary of English v.0.48 [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]