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allele (n.)

1931 in genetics, from German allel, abbreviation of allelomorph "alternative form of a gene" (1902), coined from Greek allel- "one another" (from allos "other;" from PIE root *al- (1) "beyond") + morphē "form," a word of uncertain etymology.

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Definitions of allele from WordNet

allele (n.)
(genetics) either of a pair (or series) of alternative forms of a gene that can occupy the same locus on a particular chromosome and that control the same character;
some alleles are dominant over others
Synonyms: allelomorph
From wordnet.princeton.edu