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allo-

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  1. a combining form meaning “other,” used in the formation of compound words (allotrope) and in chemistry to denote the more stable of two geometric isomers.
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Also (except in chemistry) especially before a vowel, all-.

Origin of allo-

< Greek, combining form of állos other; cognate with Latin alius, else
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for allo-

allo-

before a vowel all-

combining form
  1. indicating difference, variation, or oppositionallopathy; allomorph; allophone; allonym
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Word Origin

from Greek allos other, different
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 allo-

word-forming element meaning "other," from Greek allo-, comb. form of allos "other, different" (see alias (adv.)).

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Online Etymology Dictionary, © 2010 Douglas Harper

allo- in Medicine

allo-

pref.
  1. Other; different:allotransplantation.
  2. Isomeric:allomorphism.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.