Double, in biology

WordNet Word definitions in WordNet
adj. having a valence of two or having two valences [syn: divalent ] used of homologous chromosomes associated in pairs in synapsis [syn: double ] [ant: multivalent , univalent ]

Wikipedia Word definitions in Wikipedia
Bivalent may refer to: Bivalent (chemistry) , a molecule formed from two or more atoms bound together as a single unitmolecule Bivalent (engine) , an engine that can operate on two different type of fuel Bivalent (genetics) , a pair of homologous chromosomes ...

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
1864, of chemicals, 1899, of chromosomes, from bi- + -valent , from Latin valentem , present participle of valere "be worth" (see valiant ).\n

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Bivalent \Biv"a*lent\, a. [L. bis twice + valens, p. pr. See Valence .] (Chem.) Equivalent in combining or displacing power to two atoms of hydrogen; dyad.

Wiktionary Word definitions in Wiktionary
a. 1 (context chemistry English) Having a valence of 2. 2 (context genetics English) Of, or relating to a pair of homologous synapsed chromosomes that occur during meiosis. n. (context genetics English) Any bivalent chromosome.