bivalent

[bahy-vey-luh nt, biv-uh-]
adjective
  1. Chemistry.
    1. having a valence of two.
    2. having two valences, as aluminum with valences of two and three.
  2. Genetics. pertaining to associations of two homologous chromosomes.
noun
  1. Genetics. a pair of bivalent chromosomes, especially when pairing during meiosis.

Origin of bivalent

First recorded in 1865–70; bi-1 + -valent
Related formsbi·va·lence [bahy-vey-luh ns, biv-uh-luh ns] /baɪˈveɪ ləns, ˈbɪv ə ləns/, bi·va·len·cy, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for bivalency

bivalent

adjective
  1. chem another word for divalent
  2. (of homologous chromosomes) associated together in pairs
noun
  1. a structure formed during meiosis consisting of two homologous chromosomes associated together
Derived Formsbivalency, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for bivalency
n.

1872; see bivalent + -ency.

bivalent

adj.

1864, of chemicals, 1899, of chromosomes, from bi- + -valent, from Latin valentem, present participle of valere "be worth" (see valiant).

Online Etymology Dictionary, © 2010 Douglas Harper

bivalency in Medicine

bivalent

[bī-vālənt]
adj.
  1. Having a valence of 2; divalent.
  2. Consisting of a pair of homologous, synapsed chromosomes, as occurs during meiosis; double.
n.
  1. A pair of homologous, synapsed chromosomes associated together during meiosis.
Related formsbi•valence null n.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

bivalency in Science

bivalent

[bī-vālənt]
  1. Chemistry Having a valence of 2.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.