| 单词 | prochorion | 
| 释义 | > as lemmasprochorion   prochorion  n.  Brit.  , U.S.   Embryology rare (now disused) the membrane surrounding an ovum, which develops into the chorion; the zona pellucida, vitelline membrane, or yolk sac of an ovum.ΚΠ 1879    tr.  E. Haeckel Evol. Man II. xix. 157  				This prochorion [Ger. Prochorion] very soon disappears, and is replaced by the permanent outer egg-membrane, the chorion. 1901    Lancet 12 Jan. 106/1  				The reader [of J. C. Heisler's Textbk. Embryol. (1899)] will find definitions of many terms that have been recently introduced, such as prochorion, ameloblasts..and the like. < as lemmas  | 
	
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