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Chromosomes Antibody Bivalent Adjective  Date  Pairs Synapsis Noun

Title Bivalent
Text
Merriam-Webster's Collegiate Dictionary
bi·va·lent
I
  \\(ˌ)bī-ˈvā-lənt, ˈbī-və-\\ adjective
 DATE  1869
1. 
divalent

2. associated in pairs in synapsis

II
noun
 DATE  circa 1934
: a pair of synaptic chromosomes
English Etymology
bivalent
  1869, of chemicals, 1899, of chromosomes, from bi- + -valent, from L. valentemprp. of valere "be worth" (see valiant).
Webster's Third New International Dictionary, Unabridged
bi·valent
I. \(ˈ)bī+\ adjective
Etymology: bi- (I) + valent; translation of German zweiwertig
1. : having a valence of two
2. : 
double
 — used of homologous chromosomes associated in pairs in synapsis
3. 
 a. of an antigen, hapten, or antibody : having two sites for combination with antibody or antigen
 b. of an antibody : capable of producing agglutination or precipitation under ordinary experimental conditions
II. noun
(-s)
: a pair of synaptic chromosomes

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