egg membrane

egg membrane
any of several investments surrounding the oocyte: if derived from the oocyte itself, as the vitelline membrane, it is called primary; if from the follicular cells, as the zona pellucida, it is called secondary; if from the oviduct, as the albumen around rabbit's egg or the albumen and shell of hen's egg, it is called tertiary. Called also egg envelope and, collectively, lemma.

Medical dictionary. 2011.

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Look at other dictionaries:

  • egg membrane — noun : a membrane enveloping an egg; especially : vitelline membrane …   Useful english dictionary

  • egg-membrane — Internal egg envelope or lining, thin, tough, flexible and colorless …   Dictionary of invertebrate zoology

  • egg tooth — n. a tooth like structure on the nose or beak of young reptiles and birds used to break the egg membrane or shell at the time of hatching …   English World dictionary

  • egg tooth — noun : a hard sharp prominence on the tip of the beak or nose of embryo birds and oviparous reptiles with which they break through the eggshell; also : an analogous chitinous prominence on the head of an insect * * * a calcareous prominence at… …   Useful english dictionary

  • Egg — ([e^]g), n. [OE., fr. Icel. egg; akin to AS. [ae]g (whence OE. ey), Sw. [ a]gg, Dan. [ae]g, G. & D. ei, and prob. to OSlav. aje, jaje, L. ovum, Gr. w,o n, Ir. ugh, Gael. ubh, and perh. to L. avis bird. Cf. {Oval}.] 1. (Popularly) The oval or… …   The Collaborative International Dictionary of English

  • Egg and anchor — Egg Egg ([e^]g), n. [OE., fr. Icel. egg; akin to AS. [ae]g (whence OE. ey), Sw. [ a]gg, Dan. [ae]g, G. & D. ei, and prob. to OSlav. aje, jaje, L. ovum, Gr. w,o n, Ir. ugh, Gael. ubh, and perh. to L. avis bird. Cf. {Oval}.] 1. (Popularly) The oval …   The Collaborative International Dictionary of English

  • egg and dart — Egg Egg ([e^]g), n. [OE., fr. Icel. egg; akin to AS. [ae]g (whence OE. ey), Sw. [ a]gg, Dan. [ae]g, G. & D. ei, and prob. to OSlav. aje, jaje, L. ovum, Gr. w,o n, Ir. ugh, Gael. ubh, and perh. to L. avis bird. Cf. {Oval}.] 1. (Popularly) The oval …   The Collaborative International Dictionary of English

  • egg and tongue — Egg Egg ([e^]g), n. [OE., fr. Icel. egg; akin to AS. [ae]g (whence OE. ey), Sw. [ a]gg, Dan. [ae]g, G. & D. ei, and prob. to OSlav. aje, jaje, L. ovum, Gr. w,o n, Ir. ugh, Gael. ubh, and perh. to L. avis bird. Cf. {Oval}.] 1. (Popularly) The oval …   The Collaborative International Dictionary of English

  • Egg cleavage — Egg Egg ([e^]g), n. [OE., fr. Icel. egg; akin to AS. [ae]g (whence OE. ey), Sw. [ a]gg, Dan. [ae]g, G. & D. ei, and prob. to OSlav. aje, jaje, L. ovum, Gr. w,o n, Ir. ugh, Gael. ubh, and perh. to L. avis bird. Cf. {Oval}.] 1. (Popularly) The oval …   The Collaborative International Dictionary of English

  • Egg development — Egg Egg ([e^]g), n. [OE., fr. Icel. egg; akin to AS. [ae]g (whence OE. ey), Sw. [ a]gg, Dan. [ae]g, G. & D. ei, and prob. to OSlav. aje, jaje, L. ovum, Gr. w,o n, Ir. ugh, Gael. ubh, and perh. to L. avis bird. Cf. {Oval}.] 1. (Popularly) The oval …   The Collaborative International Dictionary of English

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