Biology. a type specimen of the sex opposite to that of the holotype.
Immunology. 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.

1915–20; allo- + type; in immunological sense, probably back formation from allotypy < French allotypie, coined in 1956

allotypic [al-uh-tip-ik] , adjective
allotypically, adverb
allotypy [al-uh-tahy-pee] , noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
allotype (ˈæləˌtaɪp)
1.  biology an additional type specimen selected because of differences from the original type specimen, such as opposite sex or morphological details
2.  immunol any of the variant forms of a particular immunoglobulin found among members of the same species

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American Heritage
Medical Dictionary

allotype al·lo·type (āl'ə-tīp')
Any of the genetically determined antigenic differences within a given class of immunoglobulin that occur among members of the same species.

al'lo·typ'ic (-tĭp'ĭk) adj.
The American Heritage® Stedman's Medical Dictionary
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Example sentences
The original description refers only to an allotype and compares paratypes to it, but does not mention a holotype.
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