a prefix occurring in loanwords from Latin, meaning “both” (ambiguous ) and “around” (ambient ); used in the formation of compound words: ambitendency.

< Latin; akin to Greek amphí, Albanian mbë, Old Irish imb, imb-, Welsh, Old Breton am, am- (variant em-), Gaulish amb(i)- (see embassy), Old High German umbi (> German um), Old English ymb(e)-, Sanskrit abhí-tas around. Cf. amphi- Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
combining form
indicating both: ambidextrous; ambivalence; ambiversion
[from Latin: round, on both sides, both, from ambo both; compare amphi-]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

combining form meaning "both, on both sides," from L. ambi- "around, round about," from PIE *ambhi- "around" (cf. Gk. amphi "round about," Skt. abhitah "on both sides," Avestan aibi, O.E. ymbe, Ger. um, Gaul. ambi-, O.Ir. imb- "round about, about," O.C.S. oba, Lith. abu "both"). The PIE root is probably
an ablative plural of *ant-bhi "from both sides," from *ant- "front, forehead" (see ante).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

ambi- or ambo-
Both: ambilateral.

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