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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.

A sudden and single emission of breath from the mouth; hence, any sudden or short blast of wind; a slight gust; a whiff. " To every puff of wind a slave." Flatman.

only had a square head. [Obs.] To shoot with arrows and quarrel. Sir J. Mandeville. Two arblasts, . . . with windlaces and quarrels. Sir W. Scott.

A tube containing the train of powder for igniting the charge in blasting.

A furnace in which cast iron is refined by the action of a blast on the molten metal.

force or sudden violence; to tear asunder; to split; to burst; as, powder rends a rock in blasting; lightning rends an oak. The dreadful thunder Doth rend the region. Shak.

A kind of dynamite used in blasting. [U.S.]

The beat of drum, or bugle blast, about break of day, to give notice that it is time for the soldiers to rise, and for the sentinels to forbear challenging. "Sound a reveille." Dryden. For at dawning to assail ye Here no bugles sound reveille. Sir W. Scott.

A blast of wind. [Prov. Eng.] Wright. That uncertain season before the rigs of Michaelmas were yet well composed. Burke. To run a rig, to play a trick; to engage in a frolic; to do something strange and unbecoming. He little dreamt when he set out Of running such a rig. Cowper.

oles in rock; esp., a machine impelled by steam or compressed air, for drilling holes for blasting, etc. -- Rock duck (Zoöl.), the harlequin duck. -- Rock eel. (Zoöl.) See Gunnel. -- Rock goat (Zoöl.), a wild goat, or ibex. -- Rock hopper (Zoöl.), a penguin of the genus Catarractes. See under Penguin. -- Rock kang…

the sandpipers, plovers, tattlers, and many others; -- called also shore birds. -- Sand blast, a process of engraving and cutting glass and other hard substances by driving sand against them by a steam jet or otherwise; also, the apparatus used in the process. -- Sand box. (a) A box with a perforated top or cover, f…

partly fused material forming a shelf, or dome-shaped obstruction, above the tuyères in a blast furnace.

A line or depression left by a cut or wound; a scar; a cicatrix. Seam blast, a blast by putting the powder into seams or cracks of rocks. -- Seam lace, a lace used by carriage makers to cover seams and edges; -- called also seaming lace. -- Seam presser. (Agric.) (a) A heavy roller to press down newly plowed furrows.…

y the arrangement of the cells in segmentation or cleavage of the ovum; the cavity of the blastosphere. In the gastrula stage, the segmentation cavity in which the mesoblast is formed lies between the entoblast and ectoblast. See Illust. of Invagination. -- Segmentation nucleus (Biol.), the body formed by fusion of th…

arious steels that harden when heated to above a red heat and cooled in air, usually in a blast of cold air with moderate rapidity, without quenching. Such steels are alloys of iron and carbon with manganese, tungsten and manganese, chromium, molybdenum and manganese, etc. They are chiefly used as high-speed steels. --…

a hot bulb or hot pot) opening into the combustion chamber, and heated for ignition by a blast-lamp until the engine is running, when it is, ordinarily, kept red hot by the heat of combustion.

Of or pertaining to the north; northern. "From cold septentrion blasts." Milton.

Evening air; night chill. [Obs.] "Some serene blast me." B. Jonson.

to begin to germinate or form; as, cuttings set well; the fruit has set well (i. e., not blasted in the blossom).

The chamber of a blast furnace. Line shaft (Mach.), a main shaft of considerable length, in a shop or factory, usually bearing a number of pulleys by which machines are driven, commonly by means of countershafts; -- called also line, or main line. -- Shaft alley (Naut.), a passage extending from the engine room to the…