blastodisk


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Related to blastodisk: blastoderm

blas·to·disk

or blas·to·disc  (blăs′tə-dĭsk′)

blas•to•disk

or blas•to•disc

(ˈblæs təˌdɪsk)

n.
the blastula forming as a flattened sphere on top of the yolk in the eggs of birds and reptiles.
[1885–90]