| 释义 |
ootid Biol.|ˈəʊətɪd|
[f. oo- after spermatid.]
A haploid cell formed by the division of a secondary oocyte; by some writers restricted to the ovum, as contrasted with the polar body.
1908F. 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. 1927W. Shumway Vert. Embryol. ii. 34 In this way four (or three, if the smaller secondary oöcyte fails to divide) oötids are produced, of which the single large cell is the ovum, while the smaller ones are known as polocytes. 1946B. M. Patten Human Embryol. ii. 31 The secondary oöcyte.. divides again, and in this division..the bulk of the cytoplasm goes to one of the two resulting oötids, which is then commonly called the ‘matured ovum’. 1964N. S. Cohn Elem. Cytol. ii. xiii. 206 The secondary oöcyte undergoes a second meiotic division, producing one large cell, the oötid, and a small second polar body. Ibid., The oötid..matures into the egg or ovum. 1972Nature 28 Jan. 213 It must be recalled that the sea urchin egg is an ootid whose maturation divisions..have been completed. |