英语词汇“egg-tooth”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

egg-tooth n. a small, hard, white protuberance developed in the embryo bird and reptile which is used to crack the egg and is cast off after hatching.

ΚΠ

1893 A. Newton et al. Dict. Birds: Pt. 1 36 The ‘egg-tooth’..is developed in the embryos of all birds as a small whitish protuberance or conglomeration of salts of calcareous matter, deposited in the middle layers of the epidermis of the tip of the upper bill.

1959 New Biology XXX. 87 In viviparous reptiles the eggshell is reduced to a thin, soft membrane or lost entirely, and the egg-tooth, which assists the young of oviparous forms to break out of their eggs, is sometimes rudimentary.

1960 M. Burton Wild Animals Brit. Isles 145 The young grass snakes..make their way out of the egg by tearing several rents in it with a special egg-tooth projecting from the front of the jaws.

单词	egg-tooth
释义	> as lemmas egg-tooth egg-tooth n. a small, hard, white protuberance developed in the embryo bird and reptile which is used to crack the egg and is cast off after hatching. ΚΠ 1893 A. Newton et al. Dict. Birds: Pt. 1 36 The ‘egg-tooth’..is developed in the embryos of all birds as a small whitish protuberance or conglomeration of salts of calcareous matter, deposited in the middle layers of the epidermis of the tip of the upper bill. 1959 New Biology XXX. 87 In viviparous reptiles the eggshell is reduced to a thin, soft membrane or lost entirely, and the egg-tooth, which assists the young of oviparous forms to break out of their eggs, is sometimes rudimentary. 1960 M. Burton Wild Animals Brit. Isles 145 The young grass snakes..make their way out of the egg by tearing several rents in it with a special egg-tooth projecting from the front of the jaws. extracted from eggn. < as lemmas
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> as lemmas