monastern.
/mɒˈnastə/, U.S. /məˈnæstər/ Cell Biology.
1. An arrangement of chromosomes in the equatorial plane of a spindle; a metaphase plate. Cf. aster n. 4(b), diaster n. Now disused.
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the world > life > biology > biological processes > genetic activity > [noun] > cell-division or arrangement of chromosomes > figure of nucleus during
monaster1879
mitosis1887
1879 E. Klein in Q. Jrnl. Microsc. Sci. 19 414 We pass..to large nuclei..in which the deeply-stained fibrils are arranged like a single aster (‘Monaster’), apparently terminating freely at the periphery, but connected into a central network.
1889 Q. Jrnl. Microsc. Sci. 30 177 The stage [of cell division] which is termed the ‘mother star’, ‘aster’, or ‘monaster’.
1900 Bull. Torrey Bot. Club 27 455 In the mature spindle the chromosomes are often quite regularly arranged in the equatorial plate forming the well-known monaster.
1923 Amer. Jrnl. Bot. 10 352 He [sc. Flemming] explains the granular structure of the longitudinal halves of the chromosomes of the monaster.
2. A unipolar (monopolar) or half spindle; (also) a single aster (aster n. 4(a)). Cf. amphiaster n.
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the world > life > biology > biological processes > genetic activity > genetic components > [noun] > chromosome > spindle or spindle fibre
spindle1878
spindle fibre1878
mitosome1895
mantle fibre1896
monaster1901
cleavage-spindle1912
telomere1940
1901 E. B. Wilson in Arch. f. Entwickelungsmechanik der Organismen 12 531 The achromatic figure may consist only of a single aster (monaster) which never resolves itself into an amphiaster.
1928 Amer. Naturalist 77 28 When..centrosomes connected with a nucleus failed to divide, monasters were formed.
1940 G. S. Carter Gen. Zool. Invertebr. iii. 54 In the division of the cell of the multicellular body, the centriole may fail to divide and a perfect but single and spherical aster is then formed (monaster).
1961 Q. Rev. Biol. 36 172/1 A monaster first appears, divides into two, and a furrow develops between the two asters.
1991 Jrnl. Cell Sci. 99 701 The chromosomes moved away from the pole to the periphery of the monaster.
1999 Proc. National Acad. Sci. U.S.A. 96 1401/1 Artificially (KCl) activated eggs that enter mitosis after completion of meiosis can assemble a maternal monaster, but not a bipolar spindle.
This entry has been updated (OED Third Edition, September 2002; most recently modified version published online March 2022).
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n.1879