Laurentian period(Geol.), the lower of the two divisions of the Archæan age; — called also the Laurentian.

(Lau"rer) n. Laurel. [Obs.] Chaucer.

(Lau"res*tine) n. [NL. lautus tinus, fr. L. laurus the laurel + tinus laurestine. See Laurel.] (Bot.) The Viburnum Tinus, an evergreen shrub or tree of the south of Europe, which flowers during the winter months. [Written also laurustine and laurestina.]

(Lau"ric) a. Pertaining to, or derived from, the European bay or laurel (Laurus nobilis).

Lauric acid(Chem.), a white, crystalline substance, C12H24O2, resembling palmitic acid, and obtained from the fruit of the bay tree, and other sources.

(Lau*rif"er*ous) a. [L. laurifer; laurus + ferre to bear.] Producing, or bringing, laurel.

(Lau"rin) n. [Cf. F. laurine.] (Chem.) A white crystalline substance extracted from the fruit of the bay and consisting of a complex mixture of glycerin ethers of several organic acids.

(Lau"ri*nol) n. [Laurin + -ol.] (Chem.) Ordinary camphor; — so called in allusion to the family name (Lauraceæ) of the camphor trees. See Camphor.

(Lau"ri*ol) n. Spurge laurel. [Obs.] Chaucer.

(Lau"rite) n. [Etymol. uncertain.] (Min.) A rare sulphide of osmium and ruthenium found with platinum in Borneo and Oregon.

(Lau"rone) n. [Lauric + - one.] (Chem.) The ketone of lauric acid.

(||Lau"rus) n. [L., laurel.] (Bot.) A genus of trees including, according to modern authors, only the true laurel and the larger L. Canariensis of Madeira and the Canary Islands. Formerly the sassafras, the camphor tree, the cinnamon tree, and several other aromatic trees and shrubs, were also referred to the genus Laurus.

(Laus) a. Loose. [Obs.] Chaucer.

(La"va) n. [It. lava lava, orig. in Naples, a torrent of rain overflowing the streets, fr. It. & L. lavare to wash. See Lave.] The melted rock ejected by a volcano from its top or fissured sides. It flows out in streams sometimes miles in length. It also issues from fissures in the earth's surface, and forms beds covering many square miles, as in the Northwestern United States.

Lavas are classed, according to their structure, as scoriaceous or cellular, glassy, stony, etc., and according to the material of which they consist, as doleritic, trachytic, etc.

Lava millstone, a hard and coarse basaltic millstone from the neighborhood of the Rhine.Lava ware, a kind of cheap pottery made of iron slag cast into tiles, urns, table tops, etc., resembling lava in appearance.

(Lav"a*ret) n. [F.] (Zoöl.) A European whitefish (Coregonus laveretus), found in the mountain lakes of Sweden, Germany, and Switzerland.

(La*vat"ic) a. Like lava, or composed of lava; lavic.

(La*va"tion) n. [L. lavatio: cf. OF. lavation.] A washing or cleansing. [Obs. or R.]

Laureled to Law

(Lau"reled) a. Crowned with laurel, or with a laurel wreath; laureate. [Written also laurelled.]

(Lau*ren"tian) a. Pertaining to, or near, the St. Lawrence River; as, the Laurentian hills.

  By PanEris using Melati.

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