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Definition of Ectomere
1. n. The more transparent cells, which finally become external, in many segmenting ova, as those of mammals.
Definition of Ectomere
1. a cell that develops into ectoderm [n -S]
Medical Definition of Ectomere
1. A blastomere (one of the cells formed during the first few divisions of the zygote) which takes part in forming the ectoderm (the outermost tissue layer of an embryo). (09 Oct 1997)