ootidn.
/ˈəʊətɪd/, U.S. /ˈoʊoʊˌtɪd/ Biology.
A haploid cell formed by the meiotic division of a secondary oocyte; spec. an ovum, as distinct from a polar body.
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the world > life > biology > biological processes > procreation or reproduction > reproductive substances or cells > [noun] > ovum or ootid
ovum1672
ovulum1698
ovule1762
ovigerm1851
ovicell1869
oosphere1875
ootid1898
1898 Archives de Biologie 15 49 The view that polar bodies are abortive or rudimentary ova, and that they together with the ovum represent four cells, the oötids,..comparable to the four spermatids arising by successive divisions from a spermatocyte of the first order.
1908 F. R. Lillie Devel. of Chick 14 The mature ovum (oötid) and the polar bodies are the precise equivalent of the four spermatids, but..only the ovum on the female side is functional.
1946 B. M. Patten Human Embryol. ii. 31 The secondary oöcyte..divides again, and..the bulk of the cytoplasm goes to one of the two resulting oötids, which is then commonly called the ‘matured ovum’.
1972 Nature 28 Jan. 213 The sea urchin egg is an ootid whose maturation divisions..have been completed.
1998 Molecular Reprod. & Devel. 50 221 Round spermatid nuclei of the pig..are competent to participate in syngamy with the ootid chromatin.
This entry has been updated (OED Third Edition, June 2004; most recently modified version published online March 2022).
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n.1898