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A small, clear space in the segments of the ovum, the precursor of the nucleus.

A blast; destruction by a blast, or by some pernicious cause. I have smitten you with blasting and mildew. Amos iv. 9.

A sudden stroke or injury produced by some destructive cause. [Obs.] Shak.

Germinating inside the pericarp, as the mangrove. Brande & C.

The cavity of the blastosphere, or segmentation cavity.

The germinal vesicle.

The germinal membrane in an ovum, from which the embryo is developed.

Of or pertaining to the blastoderm.

Multiplication or increase by gemmation or budding.

One of the Blastoidea.

One of the divisions of Crinoidea found fossil in paleozoic rocks; pentremites. They are so named on account of their budlike form.

One of the segments first formed by the division of the ovum. Balfour.

Relating to the blastophore.

That portion of the spermatospore which is not converted into spermatoblasts, but carries them.

The pore or opening leading into the cavity of invagination, or archenteron.

The hollow globe or sphere formed by the arrangement of the blastomeres on the periphery of an impregnated ovum.

In certain hydroids, an imperfect zooid, whose special function is to produce medusoid buds. See Hydroidea, and Athecata.

ment of the ovum in which the outer cells of the morula become more defined and form the blastoderm.

Same as Blastula.

Affected by blasts; gusty.