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blastosphere
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blastosphere n.
Brit. 
/ˈblastəsfɪə/
, /ˈblastəsfɪə/U.S. /ˈblæstəˌsfɪ(ə)r/
a name for the impregnated ovum, when after segmentation, it has acquired a blastocœle and blastoderm./ˈblæstəˌsfɪ(ə)r/<
as lemmas