spermatidn.
Biology.
A seminal cell which develops into a spermatozoon; spec. one that is formed by the meiotic division of a secondary spermatocyte and develops into a spermatozoon without dividing again.
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the world > life > biology > biological processes > procreation or reproduction > reproductive substances or cells > [noun] > sperm > sperm cell
spermatoon1852
spermatogonium1861
spermatocyte1886
spermatid1889
primary spermatocyte1896
spermogonium1913
1889 P. Geddes & J. A. Thomson Evol. Sex ix. 113 The sperm or spermatozoon is differentiated from an immature cell or spermatide.
1904 Biol. Bull. Feb. 150 There is the normal number of two chromosomes. The ovotid and the spermatid have each only one.
1924 E. W. MacBride Study of Heredity ii. 46 In the case of the male cell each secondary spermatocyte divides into two precisely equal cells called spermatids.
1959 W. Andrew Textbk. Compar. Histol. xii. 490 [In fishes] spermatogenesis consists of the same general cytological stages as in the invertebrates: namely, spermatogonia, spermatocytes, spermatids, and spermatozoa.
1968 New Scientist 2 May 218/2 It now appears that the X and the Y chromosomes become genetically inert before the spermatids (the cells from which the spermatozoa develop) are formed.
Derivatives
sperˈmatidal adj.
ΘΚΠ
the world > life > biology > biological processes > procreation or reproduction > reproductive substances or cells > [adjective] > sperm > sperm cell
spermatogonial1902
spermatidal1975
1975 Biochem. & Biophysical Res. Communications LXVII. 183 Proteins extracted from elongated spermatids..reveal the presence of a new spermatidal basic protein fraction.
This entry has not yet been fully updated (first published 1914; most recently modified version published online December 2020).
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