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Meaning of allotype

al•lo•type

Pronunciation: (al'u-tīp"), [key]
— n.
  1. a type specimen of the sex opposite to that of the holotype.
  2. an antibody of a given class having certain molecular sites shared by only some members of a species and therefore acting as an antigen to other members of the same species.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.