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.

combining form

  1. indicating difference, variation, or oppositionallopathy; allomorph; allophone; allonym

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


  1. Other; different:allotransplantation.
  2. Isomeric:allomorphism.

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