Polemoscope

Definitions

  • Webster's Revised Unabridged Dictionary
    • n Polemoscope An opera glass or field glass with an oblique mirror arranged for seeing objects that do not lie directly before the eye; -- called also diagonal opera glass, or side opera glass.
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Century Dictionary and Cyclopedia
    • n polemoscope A perspective glass fitted with a mirror set at an angle, designed for viewing objects that do not lie directly before the eye: so named from its possible use in warfare to observe the motions of the enemy from behind defenses. Opera-glasses also are sometimes constructed in this way, to admit of seeing persons obliquely without apparently directing the glass at them.
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Chambers's Twentieth Century Dictionary
    • n Polemoscope a perspective glass so constructed as to give views of objects not lying directly before the eye
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Etymology

Webster's Revised Unabridged Dictionary
Gr. war + -scope,: cf. F. polémoscope,
Chambers's Twentieth Century Dictionary
Gr. polemos, war.