Recessive
Recessive (re*ses"siv) , adjective
1.
Going back; receding.
2.
(Genetics) Not appearing in the phenotype unless both alleles of the organism have the same trait; -- of genetic characteristics, or of the genes coding for such characteristics, in diploid organisms. Opposite of dominant; hemophilia is a recessive trait.
Recessive (re*ses"siv) , noun
(Genetics) A genetic trait determined by a recessive{2} allele; a trait not appearing in the phenotype unless both chromosomes of the organism have the same allele; also, an allele which is recessive{2}.