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Blastoidea :: Blastoidea (n. pl.) One of the divisions of Crinoidea found fossil in paleozoic rocks; pentremites. They are so named on account of their budlike form.

Blastocyst :: Blastocyst (n.) The germinal vesicle.

Endoderm :: Endoderm (n.) The innermost layer of the blastoderm and the structures derived from it; the hypoblast; the entoblast. See Illust. of Ectoderm.

Morula :: Morula (n.) The sphere or globular mass of cells (blastomeres), formed by the clevage of the ovum or egg in the first stages of its development; -- called also mulberry mass, segmentation sphere, and blastosphere. See Segmentation..

Blast :: Blast (n.) A forcible stream of air from an orifice, as from a bellows, the mouth, etc. Hence: The continuous blowing to which one charge of ore or metal is subjected in a furnace; as, to melt so many tons of iron at a blast..

Whirl-blast :: Whirl-blast (n.) A whirling blast or wind.

Rendrock :: Rendrock (n.) A kind of dynamite used in blasting.

Blast :: Blast (v. t.) To rend open by any explosive agent, as gunpowder, dynamite, etc.; to shatter; as, to blast rocks..

Blastide :: Blastide (n.) A small, clear space in the segments of the ovum, the precursor of the nucleus..

Hypoblast :: Hypoblast (n.) The inner or lower layer of the blastoderm; -- called also endoderm, entoderm, and sometimes hypoderm. See Illust. of Blastoderm, Delamination, and Ectoderm..

Blast :: Blast (n.) A sudden, pernicious effect, as if by a noxious wind, especially on animals and plants; a blight..

Pricker :: Pricker (n.) A priming wire; a priming needle, -- used in blasting and gunnery..

Splanchno-skeleton :: Splanchnopleure (n.) The inner, or visceral, one of the two lamellae into which the vertebrate blastoderm divides on either side of the notochord, and from which the walls of the enteric canal and the umbilical vesicle are developed. See Somatopleure..

Tuyere :: Tuyere (n.) A nozzle, mouthpiece, or fixture through which the blast is delivered to the interior of a blast furnace, or to the fire of a forge..

Nip :: Nip (v. t.) Hence: To blast, as by frost; to check the growth or vigor of; to destroy..

Planoblast :: Planoblast (n.) Any free-swimming gonophore of a hydroid; a hydroid medusa.

Entosthoblast :: Entosthoblast (n.) The granule within the nucleolus or entoblast of a nucleated cell.

Tamp :: Tamp (v. t.) In blasting, to plug up with clay, earth, dry sand, sod, or other material, as a hole bored in a rock, in order to prevent the force of the explosion from being misdirected..

Blasting :: Blasting (p. pr. & vb. n.) of Blas.

Discoblastic :: Discoblastic (a.) Applied to a form of egg cleavage seen in osseous fishes, which occurs only in a small disk that separates from the rest of the egg..

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