blasting (blasting)

[ I have smitten you with blasting and mildew. Amos iv. 9. 2. The operation of splitting rocks by gunpowder or other explosive. Blasting-compounds, substances used in blasting. The more important are IMG:content-2156.png:[blocks in formation] IMG:content-2157.png:[blocks in formation] germ, + κύστις , bladder (cyst).] The germinal vesicle. N. E. D. See blastoderm . blastoderm (blas'tō-derm), n. [ δέρμα , skin: see derm .] In embryol ., the primitive membrane or layer of cells re- sulting from the subdivision of the germ (the segmentation of the vitellus or yolk). It is further all Metazoa into at least two membranes or cell-layers, an inner and an outer, the endoderm and the ectoderm; and still further modified in most Metazoa by the production of a third layer, the mesoderm, between the other two. The outer layer is also called epiblast; the inner, hypoblast; the middle, mesoblast. See extract un- der Metazoa , and cut under cyathozoöid. blasting-gelatin (blasting jelatin blasting-compound consisting of 7 parts of gun- cotton and 4 of camphor di olved in 89 parts blastoderm a tic (blastō-der-mat'ik), a . [ blas- blast-lamp (blåst'lamp), n. A lamp in which combustion is a isted by an artificially pro- duced draft of air. blastment (blast'ment), n. [ blast , v., + -ment.] Blast; a sudden stroke of some de- In the morn and liquid dew of youth Contagious blastments are most imminent. germ, + δίσκος, a disk: see disk .] An aggrega- tion of formative protoplasm at one pole of the IMG:content-2158.png:[blocks in formation] blastogenesis (blas-to-jen'e-sis), n. [ βλαστός , a germ, + γένεσις , generation.] In biol ., reproduction by gemmation or budding. germ, + -γένεια , generation: see- geny .] The germ-history of an individual living organism; the history of the evolution of a body as a whole, as distinguished from histogeny and or- ganogeny, which relate to the special germ-his- tory tor of of the the ti ues ti ues and and organs. organs. It is a term used blastoid (blas'toid), a . and n. [See Blastoidea .] I. a. Having the characters of or pertaining to the Blastoidea : as, a blastoid crinoid. II. n. An echinoderm of the group Blas- Blastoidea (blas-toi'de-a), n . pl . [NL., βλαστός , a germ, + εἶδος , form.] A group of fo il pelmatozoan echinoderms without arms, with ambulacra fringed on each side by pointed appendages in close relation with side-plates, which rest on or against a sub ambulacral lan- cet-plate pierced by a canal which lodges a water-ve el, and with hydro spires arranged in 10 or 8 groups limited to the radial and inter- radial plates. The group was (a) originally proposed by Say in 1825 as a family; (b) accepted by Leuckart in 1848 as an order; (c) by Roemer in 1852 as a suborder; (d) by Brown in 1860 as a cla ; (e) by others as a subcla ; and (f) modified by Ethe ridge and Carpenter in 1886 blastocœle (blastō-sel), n . [ κοῖλος , hollow.] In embryol ., the cavity cla divided into two orders, Regula res and Irregulares . The species range from the Upper Silurian to the Car- boniferous. Also Blasteroidea . blastomere (blas'tō-mer), n. [ μέρος , a part.] In embryol., one of the segments or derivative cells into which the vitellus or yolk of an ovum of one of the Meta- zoa divides after fecundation. See cut under gastrulation. blastomeric (blas-tō-mer'ik), a . [ blastomere +-ic.] Pertaining to or of the nature of a blastomere; characterized by segmentation of the yolk or vitellus. blast on euro pore (blas-tō-nūrō-por), n. [ blasto (pore) + neuropore .] A transient ori- fice in the embryo of some animals, resulting from the fusion of a neuropore with the blasto- pore. See neuropore. blastophore (blas'tō-for), n. [ germ, + -φόρος , -bearing, bear1 .] The pa ive portion of a sperm-cell or spermo- spore which does not give rise to spermatozoa. blastophyllum (blas-to-fil'um), n.; pl. blasto- phylla (-a). [ NL., βλαστός , a germ, + φύλλον = L. folium , a leaf.] In embryol ., either one of the two primary germ-layers of a gas- trula of the Metazoa ; an endoderm or an ecto- IMG:content-2159.png:[blocks in formation] blastostylar (blas-to-stīʻlar), a . [ blastostyle + -ar .] Pertaining to a blastostyle. blastostyle (blas'to-stil), n. [ βλαστός , α germ, + στι στῦλος, a pillar: see style2 .] In zoöl., a column i form zoöid destined to give origin to generative buds; a long simple zoöid, without mouth or tentacles. Also called gonoblastidium . In some blastostyles , during the development of the buds of the gonophores, the ectoderm splits into two layers. the interspace between these two, the budding gonophores project, and may emerge from the summit of the gonangium thus formed. blast-pipe (blast'pīp), n. The exhaust-pipe of a steam-engine. In locomotives and in some station- ary steam-engines it is directed into the smoke-stack, with the effect of inducing a strong draft. blast-recorder (blast'rē-kôr dėr), n. trivance for recording automatically the time during which a hot-blast stove is in blast or out of blast. It is operated by clockwork, and is de- signed to give an uninterrupted record of the work and rest of a number of stoves for a week. IMG:content-2160.png:[graphic] blast-regulator (blast'reg"ū-lā-tor), n. milling , a governor for controlling the blast of a grain-separator. blastula (blas tū-la), n.; pl. blastulæ (-lē). [NL., dim. of Gr. βλαστός , a germ: see blas- tus .] In embryol .: (a) An embryo of one of the Metazoa , in the stage in which it consists of a sac formed of a single layer of cells. (b) In Haeckel's vocabulary of embryology, same as blastosphere , ( b ). blastula pore (blas'tū-la-por), n. [Prop. * blas- tulopore , blastula , q. v., + L. por us , pore.] The pore or orifice of a blastula. blastulation (blas-tū-lā'shon), n. [ blastula + -ation.] In embryol., the proce by which a germ becomes a blastula; the conversion of a germ into a blastula. See blastula . In most ani- mals it precedes the proce of gastrulation (which see), and consists in the conversion of a solid mulberry-ma of cleavage-cells (morula proper) into a hollow sphere or blastosphere (vesicular morula). In case it follows gas- trulation, as in a mammal, it consists in the conversion of what is called a kino genetic meta gastrula (which see) into a physiologically similar but morphologically different hollow ball, commonly known as the blastodermic vesicle. blast us (blas'tus), n.; pl. blast i (-tī). [NL., βλαστός , a germ, bud, sprout, shoot, στάνειν (βλαστ-), bud, sprout, grow, prop. of plants, but also of animals.] In bot . , the plumule of gra es. IMG:content-2161.png:[blocks in formation] blatcht, v. t. [ blacchen , blæcchen ; from the noun. Cf. black , v ., and bletch , v. Not con- nected with blotch , q. v.] To smear with black- ing; black. No man can like to be smutted and blatched in his face. Harmar, tr. of Beza's Sermons, p. 195. blatel (blāt), a. [Formerly also written blait , bleat ; appar. blate , bleizza , lividne .] 11. Pale; ghastly.-24. Dull; spiritle ; stu- pid.-31. Blunt; curt.-4. Bashful; diffident. [North. Eng. and Scotch.] The youngster's artle heart o'erflows wi' joy, But blate and laithfu', scarce can weel behave. ble, prattle , etc., all more or le imitative.] 1. To give forth or produce a quick succe ion of slight sounds; patter: as, “the rain blattered ," Jeffrey.-2. To speak or prate volubly; rail or rage. [Rare.] However envy list to blatter against him. Spenser, State of Ireland. blatter (blat'er), n. [ ter , v.] 1. A rattling or clat- tering noise (as of boards falling).-2. A volley of clattering words. blatterer (blat'er-ér), п. One who blatters; a noisy blustering boaster. blattering (blat'er-ing), n. [Verbal n. of blatter , v.] Sensele blustering. blatter oont (blat-e-rön'), n. [ blatero ( n- ), a babbler, blater are , babble: see blat- ter.] A sensele babbler. I trusted T. P. with a weighty se- cret, conjuring him that it should not take air and go abroad, XX To