Etymology
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Words related to binocular

binary (adj.)
"dual, twofold, double," mid-15c., from Late Latin binarius "consisting of two," from bini "twofold, two apiece, two-by-two" (used especially of matched things), from bis "double" (from PIE root *dwo- "two"). Binary code in computer terminology was in use by 1952, though the idea itself is ancient. Binary star in astronomy is from 1802.
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*okw- 

Proto-Indo-European root meaning "to see."

It forms all or part of: amblyopia; antique; antler; atrocity; autopsy; binocle; binocular; biopsy; catoptric; Cyclops; daisy; enoptomancy; eye; eyelet; ferocity; hyperopia; inoculate; inveigle; monocle; monocular; myopia; necropsy; ocular; oculist; oculus; oeillade; ogle; ophthalmo-; optic; optician; optics; optometry; panoptic; panopticon; Peloponnesus; pinochle; presbyopia; prosopopeia; stereoptican; synopsis; triceratops; ullage; wall-eyed; window.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit akshi "the eye; the number two," Greek osse "(two) eyes," opsis "a sight;" Old Church Slavonic oko, Lithuanian akis, Latin oculus, Greek okkos, Tocharian ak, ek, Armenian akn "eye."

binocle (n.)
"telescope or opera glass with two tubes for use by both eyes at once," 1690s, from French binocle (17c.), from Latin bini- "two by two, twofold, two apiece" (see binary) + oculus "eye" (from PIE root *okw- "to see").
binoculars (n.)
1866; see binocular. Earlier binocle (1690s).
pinochle (n.)

once-popular American game played with a double 24-card pack, originally German, also pinocle, etc., 1864, Peaknuckle, of obscure origin (as are the names of many card games), evidently from Swiss dialect Binokel (German), binocle (French), from French binocle "pince-nez" (17c.), from Medieval Latin binoculus "binoculars" (see binocular).

Binokel was the name of a card game played in Württemberg, related to the older card game bezique and the name is perhaps from French bésigue "bezique," the card game, wrongly identified with besicles "spectacles," perhaps because the game is played with a double deck. Pinochle was popularized in U.S. late 1800s by German immigrants.