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blastomere
blastomere n.
Brit. 
/ˈblastəmɪə/
, /ˈblastəmɪə/U.S. /ˈblæstəˌmɪ(ə)r/
each of the segments into which the impregnated ovum at first divides./ˈblæstəˌmɪ(ə)r/ΚΠ
1877 T. H. Huxley Man. Anat. Invertebrated Animals Introd. 16 Tracing the several germ layers back to the blastomeres of the yelk.
1881 Jrnl. Microsc. Soc. Jan. 147 There are two kinds of blastomeres, the larger form the lower half of the egg, the smaller ones the upper half.
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as lemmas