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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.
Also (except in chemistry), especially before a vowel, all-.
Origin of allo-
< Greek, combining form of állos other; cognate with Latin alius, else Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for allo-


combining form
indicating difference, variation, or opposition: allopathy, allomorph, allophone, allonym
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
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Word Origin and History for allo-

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

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

allo- or all-

  1. Other; different: allotransplantation.

  2. Isomeric: allomorphism.

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