Noun
A dioptric telescope, fitted with two tubes joining, so as to enable a person to view an object with both eyes at once; a double-barreled field glass or an opera glass.
Source: Webster's dictionaryFrench wiktionary entry for "binocle" The word is also possibly derived from the French word, binage, for the combination of cards called "binocle". Source: Internet
The French word binocle also meant "eyeglasses". Source: Internet