| 单词 |
oogonium |
| 释义 |
‖ oogonium Bot.|əʊəʊˈgəʊnɪəm|
Also rarely in anglicized form oogone. Pl. oogonia.
[mod.L., dim. of Gr. *ᾠογόνος egg-layer (cf. ὠογονία laying of eggs).]
1. The female reproductive organ in the Thallophytes or lower Cryptogams, usually a rounded cell or sac containing one or more oospheres.
Usually distinguished from the flask-shaped archegonium of the higher Cryptogams, but sometimes including this.
1867Hogg Microsc. ii. i. 293 Organs similar to those long since discovered by Tulasne in Peronospora, which have been called Oogonia. 1874Cooke Fungi 170 Here, as in the Algæ, the spermatozoids introduce themselves into the cavity of the oogonium, and unite with the gonospheres. 1885Klein Micro-Org. 146 At the end of a mycelial thread a cell grows up into a spherical large ball, the oogonium.
2. Biol. [coined in Ger. as ovogonium (T. Boveri 1892, in Anat. Hefte Abt. II. I. 446): see ovo-.] A primordial female reproductive cell that gives rise to primary oocytes by mitosis.
1895Jrnl. R. Microsc. Soc. 511 The oogonia show a nucleus with few chromatin fragments and a very delicate, but dense linin-framework. 1920L. Doncaster Introd. Study Cytol. v. 61 After a number of divisions..the spermatogonia and oogonia cease to divide and begin to increase considerably in size. At this stage they are called primary spermatocytes..and oocytes. 1940G. A. Baitsell Human Biol. xii. 319 The immature egg or oögonium. 1970Ambrose & Easty Cell Biol. x. 330 In the female the oögonia, corresponding to spermatogonia, give rise to oöcytes. |
英语词典包含277258条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。
相关内容11：
相关热词搜索：oogonium英英词典英英释义英语词汇意思用法释义英语
单词 oogonial 释义 oogonial, a.|gnl|[f. oogonium + -al.]Of or pertaining to an oogonium.19......
单词 deep-mined 释义 deep-mined adj (of coal) taken from far down in the earth （指煤）从地......
字词 间苯三酚肟 释义 【化】 phloroglucinol trioxime 汉译英翻译词典收录405719条汉英翻译词......
单词 debtor 释义 debtor n person who owes money to sb 债务人 receive payment from one&acut......
字词 间脑自发性癫痫 释义 【医】 diencephalic autonomic epilepsy 汉译英翻译词典收录40571......
字词 间脑的 释义 【医】 diencephalic 汉译英翻译词典收录405719条汉英翻译词条，基本涵盖了......