Bible Dictionaries
Polemoscope

Webster's Dictionary

(n.) An opera glass or field glass with an oblique mirror arranged for seeing objects do not lie directly before the eye; - called also diagonal, / side, opera glass.

Bibliography Information
Webster, Noah. Entry for 'Polemoscope'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​p/polemoscope.html. 1828.