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noun Blastoderm n. (Embryology) The early stage of an embryo after the first cleavages of the ovum; also, the layer of cells of which the early embryo is composed; specifically: (a)The early embryo developing from a blastodisc, after the blastocoel has formed. (b)In an insect embryo, the layer of cells that surrounds the internal mass of the yolk.
Collaborative International Dictionary of English 0.48
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