Source : Webster's Revised Unabridged Dictionary (1913)

Allelomorph \Al*le"lo*morph\, n. [Gr. ? of one another + Gr. ?
   form.] (Biol.)
   One of the pure unit characters commonly existing singly or
   in pairs in the germ cells of Mendelian hybrids, and
   exhibited in varying proportion among the organisms
   themselves. Allelomorphs which under certain circumstances
   are themselves compound are called {hypallelomorphs}. See
   {Mendel's law}. -- {Al*le`lo*mor"phic}, a.

         As we know that the several unit characters are of such
         a nature that any one of them is capable of
         independently displacing or being displaced by one or
         more alternative characters taken singly, we may
         recognize this fact by naming such characters
         allelomorphs.                            --Bateson.

Source : WordNet®

allelomorph
     n : one of two alternate forms of a gene that can have the same
         locus on homologous chromosomes and are responsible for
         alternative traits; "some alleles are dominant over
         others" [syn: {allele}]