| 单词 | winter ovum |
| 释义 | > as lemmaswinter ovum winter ovum n. Zoology (now rare) (usually in plural) a thick-shelled egg that is produced in the autumn by various (esp. freshwater) invertebrates, remaining dormant until the spring; = winter egg n. (b).Contrasted with summer ovum n. at summer n.1 and adj. Compounds 3. ΘΚΠ the world > animals > invertebrates > bodies or parts > [noun] > winter eggs winter egg1840 winter ovum1841 1841 A. Pritchard Hist. Infusoria 351 The egg is worthy of notice, having sometimes a smooth soft shell, at others a hard spinous one; the latter is termed the winter ovum. 1888 G. Rolleston & W. H. Jackson Forms Animal Life (ed. 2) 634 The ova [of Rotifers] are of three kinds, small male ova, thin-shelled summer ova, and thick-shelled winter or, better, resting ova. 2007 J. Elwick Styles Reasoning Brit. Life Sci. vi. 134 Sex thus became the only way to distinguish ‘true’ ova from various other kinds of reproductive masses like the various buds, gemmae, winter ova and ephippial ova. < as lemmas |
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