teinoscope

Ancient Greek τείνω (teínō, “I extend”) + +‎ -scope.

teinoscope (plural teinoscopes)

1. 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

• prism telescope

• “teinoscope”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.

• osteopenic