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bin-

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  1. a combining form meaning “two,” “two at a time,” used in the formation of compound words: binary; binocular.
Compare bi-1.

Origin of bin-

combining form of Latin bīnī two each, by twos
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for bin-

bin-

prefix
  1. a variant, esp before a vowel, of bi- 1 binocular
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
bin- in Medicine

bin-

pref.
  1. Variant ofbi-1
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.