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

combining form of Latin bīnī two each, by twos Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
bi- or (sometimes before a vowel) bin-1
combining form
1.  two; having two: bifocal
2.  occurring every two; lasting for two: biennial
3.  on both sides, surfaces, directions, etc: bilateral
4.  occurring twice during: biweekly
5.  a.  denoting an organic compound containing two identical cyclic hydrocarbon systems: biphenyl
 b.  (rare in technical usage) indicating an acid salt of a dibasic acid: sodium bicarbonate
 c.  (not in technical usage) equivalent of di-
[from Latin, from bistwice]
bin- or (sometimes before a vowel) bin-1
combining form
[from Latin, from bistwice]

a variant, esp before a vowel, of bi- : binocular

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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American Heritage
Medical Dictionary

bin- pref.
Variant of bi-1.

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