- binocular (adj.)
- 1738, "involving both eyes," from Fr. binoculaire, from L. bini "two by two, twofold, two apiece" (especially of matching things) + ocularis "of the eye," from oculus "eye" (see eye). The double-tubed telescopic instrument (1871, short for binocular glass) earlier was called a binocle (1690s).