scoria
121Peperine — Pep e*rine, Peperino Pep e*ri no, n. [It. peperino, L. piper pepper. So called on account of its color.] (Geol.) A volcanic rock, formed by the cementing together of sand, scoria, cinders, etc. [1913 Webster] …
122Peperino — Peperine Pep e*rine, Peperino Pep e*ri no, n. [It. peperino, L. piper pepper. So called on account of its color.] (Geol.) A volcanic rock, formed by the cementing together of sand, scoria, cinders, etc. [1913 Webster] …
123Pumice — Pum ice, n. [L. pumex, pumicis, prob. akin to spuma foam: cf. AS. pumic st[=a]n. Cf. {Pounce} a powder, {Spume}.] (Min.) A very light porous volcanic scoria, usually of a gray color, the pores of which are capillary and parallel, giving it a… …
124pumice stone — Pumice Pum ice, n. [L. pumex, pumicis, prob. akin to spuma foam: cf. AS. pumic st[=a]n. Cf. {Pounce} a powder, {Spume}.] (Min.) A very light porous volcanic scoria, usually of a gray color, the pores of which are capillary and parallel, giving it …
125Recrement — Rec re*ment (r?k r?*ment), n. [L. recrementum; pref. re re + cernere, cretum, to separate, sift: cf. F. r[ e]cr[ e]ment.] 1. Superfluous matter separated from that which is useful; dross; scoria; as, the recrement of ore. [1913 Webster] 2. (Med.) …
126Scoriform — Sco ri*form, a. In the form of scoria. [1913 Webster] …
127Scum — (sk[u^]m), n. [Of Scand. origin; cf. Dan. & Sw. skum, Icel. sk[=u]m, LG. schum, D. schuim, OHG. sc[=u]m, G. schaum; probably from a root meaning, to cover. [root]158. Cf. {Hide} skin, {Meerschaum}, {Skim}, v., {Sky}.] [1913 Webster] 1. The… …
128Slag — (sl[a^]g), n. [Sw. slagg, or LG. slacke, whence G. schlacke; originally, perhaps, the splinters struck off from the metal by hammering. See {Slay}, v. t.] 1. The dross, or recrement, of a metal; also, vitrified cinders. [1913 Webster] 2. The… …