bivalentadj.n.

/ˈbɪvələnt/

Etymology: < bi- comb. form 3 + -valent, < Latin valēntem, present participle of valēre to be worth.

1. Chemistry. Combining with two atoms of an element or radicle; also divalent.

ΘΚΠ

the world > matter > chemistry > valency > [adjective] > having a valency of two

bivalent1869

divalent1869

1869 Eng. Mechanic 12 Nov. 198/3 The elements are classified as..diatomic or bivalent..as sulphur.

1880 E. Cleminshaw tr. C. A. Wurtz Atomic Theory 121 Mercury, cadmium, and probably other bivalent metals.

2. Biology. Applied to homologous chromosomes united in pairs at the first division of meiosis. Hence as n.

ΘΚΠ

the world > life > biology > biological processes > genetic activity > genetic components > [adjective] > chromosome > chromosomes in respect of meiosis

non-homologous1883

quadrivalent1898

univalent1898

bivalent1899

plurivalent1901

homologous1903

heterotropic1905

monovalent1906

heteromorphic1917

homomorphic1917

trivalent1921

multivalent1929

sexivalent1931

nullisomic1932

quinquevalent1935

the world > life > biology > biological processes > genetic activity > genetic components > [noun] > chromosome > chromosomes in respect of meiosis

trivalency1888

zygosome1905

bivalence1909

zygonema1911

trivalent1922

quadrivalent1923

quinquevalent1926

multivalent1929

nullisomic1932

bivalent1937

nullisome1944

1899 J. H. McGregor in Jrnl. Morphol. 15 Suppl. 81 The only possibility of a true reduction..is by conceiving the chromosomes to be ‘bivalent’..and to assume that the halves of these bivalent chromosomes form new connections before the final mitosis.

1937 Nature 30 Oct. 760/2 When the bivalent..attempts to divide, the ‘dicentric’ chromatid forms a bridge between the daughter nuclei.

1949 C. D. Darlington & K. Mather Elements of Genetics i. 30 The compact paired, or bivalent, chromosomes..lie evenly in the nucleus.

1952 New Biol. 13 35 Sometimes during the nuclear divisions, four chromosomes similar to each other all ‘pair’ together, forming a quadrivalent, instead of the usual two pairs of bivalents.

This entry has not yet been fully updated (first published 1887; most recently modified version published online June 2019).

单词	bivalent
释义	bivalentadj.n. /ˈbɪvələnt/ Etymology: < bi- comb. form 3 + -valent, < Latin valēntem, present participle of valēre to be worth. 1. Chemistry. Combining with two atoms of an element or radicle; also divalent. ΘΚΠ the world > matter > chemistry > valency > [adjective] > having a valency of two bivalent1869 divalent1869 1869 Eng. Mechanic 12 Nov. 198/3 The elements are classified as..diatomic or bivalent..as sulphur. 1880 E. Cleminshaw tr. C. A. Wurtz Atomic Theory 121 Mercury, cadmium, and probably other bivalent metals. 2. Biology. Applied to homologous chromosomes united in pairs at the first division of meiosis. Hence as n. ΘΚΠ the world > life > biology > biological processes > genetic activity > genetic components > [adjective] > chromosome > chromosomes in respect of meiosis non-homologous1883 quadrivalent1898 univalent1898 bivalent1899 plurivalent1901 homologous1903 heterotropic1905 monovalent1906 heteromorphic1917 homomorphic1917 trivalent1921 multivalent1929 sexivalent1931 nullisomic1932 quinquevalent1935 the world > life > biology > biological processes > genetic activity > genetic components > [noun] > chromosome > chromosomes in respect of meiosis trivalency1888 zygosome1905 bivalence1909 zygonema1911 trivalent1922 quadrivalent1923 quinquevalent1926 multivalent1929 nullisomic1932 bivalent1937 nullisome1944 1899 J. H. McGregor in Jrnl. Morphol. 15 Suppl. 81 The only possibility of a true reduction..is by conceiving the chromosomes to be ‘bivalent’..and to assume that the halves of these bivalent chromosomes form new connections before the final mitosis. 1937 Nature 30 Oct. 760/2 When the bivalent..attempts to divide, the ‘dicentric’ chromatid forms a bridge between the daughter nuclei. 1949 C. D. Darlington & K. Mather Elements of Genetics i. 30 The compact paired, or bivalent, chromosomes..lie evenly in the nucleus. 1952 New Biol. 13 35 Sometimes during the nuclear divisions, four chromosomes similar to each other all ‘pair’ together, forming a quadrivalent, instead of the usual two pairs of bivalents. This entry has not yet been fully updated (first published 1887; most recently modified version published online June 2019). < adj.n.1869
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