I. bī-ˈnä-kyə-lər, bə- adjective
Date: 1738
: of, relating to, using, or adapted to the use of both eyes
binocular vision
• bin·oc·u·lar·i·ty (ˌ)bī-ˌnä-kyə-ˈler-ə-tē, -ˈla-rə-, bə- noun
• bin·oc·u·lar·ly bī-ˈnä-kyə-lər-lē, bə- adverb
II. bə-ˈnä-kyə-lər, bī- noun
Date: 1871
1. : a binocular optical instrument
2. : a handheld optical instrument composed of two telescopes and a focusing device and usually having prisms to increase magnifying ability — usually used in plural