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Gastrula :: Gastrula (n.) An embryonic form having its origin in the invagination or pushing in of the wall of the planula or blastula (the blastosphere) on one side, thus giving rise to a double-walled sac, with one opening or mouth (the blastopore) which leads into the cavity (the archenteron) lined by the inner wall (the hypoblast). See Illust. under Invagination. In a more general sense, an ideal stage in embryonic development. See Gastraea..

Bleak :: Bleak (a.) Cold and cutting; cheerless; as, a bleak blast..

Fuse :: Fuse (n.) A tube or casing filled with combustible matter, by means of which a charge of powder is ignited, as in blasting; -- called also fuzee. See Fuze..

Tubularida :: Tubularida (n. pl.) An extensive division of Hydroidea; the tubularians; -- called also Athecata, Gymnoblastea, and Tubulariae..

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..

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

Thunderstrike :: Thunderstrike (v. t.) To strike, blast, or injure by, or as by, lightning..

Gonoblastidia :: Gonoblastidia (pl. ) of Gonoblastidiu.

Cnidocil :: Cnidocil (n.) The fine filiform process of a cnidoblast.

Reed :: Reed (n.) A tube containing the train of powder for igniting the charge in blasting.

Neuro-epidermal :: Neuro-epidermal (a.) Pertaining to, or giving rise to, the central nervous system and epiderms; as, the neuroepidermal, or epiblastic, layer of the blastoderm..

Blast Pipe :: Blast pipe () The exhaust pipe of a steam engine, or any pipe delivering steam or air, when so constructed as to cause a blast..

Spermosphere :: Spermosphere (n.) A mass or ball of cells formed by the repeated division of a male germinal cell (spermospore), each constituent cell (spermoblast) of which is converted into a spermatozoid; a spermatogemma..

Mesoplast :: Mesoplast (n.) The nucleus of a cell; mesoblast.

Blastogenesis :: Blastogenesis (n.) Multiplication or increase by gemmation or budding.

Protovertebra :: Protovertebra (n.) One of the primitive masses, or segments, into which the mesoblast of the vertebrate embryo breaks up on either side of the anterior part of the notochord; a mesoblastic, or protovertebral, somite. See Illust. of Ectoderm..

Spermatogonium :: Spermatogonium (n.) A primitive seminal cell, occuring in masses in the seminal tubules. It divides into a mass (spermosphere) of small cells (spermoblast), which in turn give rise to spermatozoids..

Dam :: Dam (n.) A firebrick wall, or a stone, which forms the front of the hearth of a blast furnace..

Blasted :: Blasted (a.) Blighted; withered.

Blaster :: Blaster (n.) One who, or that which, blasts or destroys..

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