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Composed of, or derived from, silicon and fluorine. Fluosilicic acid, a double fluoride of hydrogen and silicon, H2F6Si, obtained in solution in water as a sour fuming liquid, and regarded as the type of the fluosilicates; -- called also silicofluoric acid, and hydrofluosilicic acid.

The outer canvas of a tent with double top, usually drawn over the ridgepole, but so extended as to touch the roof of the tent at no other place.

To lap or lay in plaits or folds; to lay one part over another part of; to double; as, to fold cloth; to fold a letter. As a vesture shalt thou fold them up. Heb. i. 12.

rder, consisting of two infinite branches, which have a common asymptote. The curve has a double point, and a leaf-shaped loop; whence the name. Its equation is x3 + y3 = axy.

or through fear of which, anything is done. [Obs.] We 'll have a bib, for spoiling of thy doublet. Beau. & Fl. For, or As for, so far as concerns; as regards; with reference to; -- used parenthetically or independently. See under As. As for me and my house, we will serve the Lord. Josh. xxiv. 15. For me, my stormy voya…

Having a double meaning; ambiguous; equivocal. Cross forked (Her.), a cross, the ends of whose arms are divided into two sharp points; -- called also cross double fitché. A cross forked of three points is a cross, each of whose arms terminates in three sharp points. -- Forked counsel, advice pointing more than one way…

r the head at pleasure, and is girded by a cord. Frock coat, a body coat for men, usually doublebreasted, the skirts not being in one piece with the body, but sewed on so as to be somewhat full. -- Smock frock. See in the Vocabulary.

petals, eight stamens, and a single pistil. They are natives of Mexico and South America. Double-flowered varieties are now common in cultivation.

Double planking of a ship's side.

h as that above a Gothic arch in a doorway. Bell gable. See under Bell. -- Gable roof, a double sloping roof which forms a gable at each end. -- Gable wall. Same as Gable (b). -- Gable window, a window in a gable.

A primeval larval form; a double-walled sac from which, according to the hypothesis of Haeckel, man and all other animals, that in the first stages of their individual evolution pass through a two-layered structural stage, or gastrula form, must have descended. This idea constitutes the Gastræa theory of Haeckel. See G…

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 embryo…

To provide with gearing. Double geared, driven through twofold compound gearing, to increase the force or speed; -- said of a machine.

To double. [R.] B. Jonson.

Double; in pairs. Sir T. Browne.

harging the same office, technically called a compound girder. See Illusts. of Frame, and Doubleframed floor, under Double. Bowstring girder, Box girder, etc. See under Bowstring, Box, etc. -- Girder bridge. See under Bridge. -- Lattice girder, a girder consisting of longitudinal bars united by diagonal crossing bars…

to consonant or consonant to vowel in a syllable, or from one component to the other of a double or diphthongal consonant (see Guide to Pronunciation, §§ 19, 161, 162). Also (by Bell and others), the vanish (or brief final element) or the brief initial element, in a class of diphthongal vowels, or the brief final or in…

phous, deliquescent powder, (CO.H)2, obtained by the partial oxidation of glycol. It is a double aldehyde, between glycol and oxalic acid.

or of plate, defending the throat and upper part of the breast, and forming a part of the double breastplate of the 14th century.

, acid green, malachite green, Victoria green, solid green, etc. It is usually found as a double chloride, with zinc chloride, or as an oxalate. (b) See Paris green (below). -- Gaignet's green (Chem.) a green pigment employed by the French artist, Adrian Gusgnet, and consisting essentially of a basic hydrate of chromi…