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The Collaborative International Dictionary
Teinoscope

Teinoscope \Tei"no*scope\, n. [Gr. ? to extend + -scope.] (Physics) An instrument formed by combining prisms so as to correct the chromatic aberration of the light while linear dimensions of objects seen through the prisms are increased or diminished; -- called also prism telescope.
--Sir D. Brewster.

Wiktionary
teinoscope

n. An instrument formed by combining prisms so as to correct the chromatic aberration of the light while linear dimensions of objects seen through the prisms are increased or diminished