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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 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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British Dictionary definitions for bin-


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
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bin- in Medicine

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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