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Abbreviation of "binocular glass".
Etymology from Wiktionary, CC BY-SA 4.0.
Today it means: A hand-held device consisting of a series of lenses and prisms, used to magnify objects so that they can be better seen from a distance, and looked at through both eyes. Full definition →
Abbreviation of "binocular glass".
Etymology from Wiktionary, CC BY-SA 4.0.