A hollow ball of cells formed at the end of the cleavage stage of embryonic development.
From the BioTech Dictionary at http://biotech.icmb.utexas.edu/. For further information see the BioTech homenode.
Blas"tu*la (?), n. [NL., dim. of Gr. a sprout.] Biol.
That stage in the development of the ovum in which the outer cells of the morula become more defined and form the blastoderm.
© Webster 1913.
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