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amphi-

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  1. a prefix occurring in loanwords from Greek (amphibious); on this model, used with the meaning “two,” “both,” “on both sides,” in the formation of compound words: amphiaster.
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Origin of amphi-

< Greek, combining form of amphí on both sides; cognate with Latin amb(i)- ambi-, Albanian mbë; akin to Old English ymb(e)- around
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for amphi-

amphi-

prefix
  1. on both sides; at both ends; of both kindsamphipod; amphitrichous; amphibious
  2. aroundamphibole
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Word Origin

from Greek
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

Word Origin and History for amphi-

before a vowel amph-, word-forming element from Greek amphi- "both, of both kinds, on both sides, around," comb. form of amphi "round about, around;" cognate with Latin ambi- (see ambi-).

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Online Etymology Dictionary, © 2010 Douglas Harper
amphi- in Medicine

amphi-

pref.
  1. Both:amphibaric.
  2. On both sides:amphicentric.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.