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ed from the Æsculus hippocastanum, or horse- chestnut, and characterized by its fine blue fluorescent solutions. [Written also æsculin.]

The waving of a weapon or other thing; a brandishing; as, the fluorish of a sword.

A fluoride. [Obs.]

A combining form indicating fluorine as an ingredient; as in fluosilicate, fluobenzene.

Pertaining to, derived from, or consisting of, fluorine and boron. Fluoridic acid (Chem.), a double fluoride, consisting essentially of a solution of boron fluoride, in hydrofluoric acid. It has strong acid properties, and is the type of the borofluorides. Called also borofluoric acid.

See Borofluoride.

A fluoride of cerium, occuring near Fahlun in Sweden. Tynosite, from Colorado, is probably the same mineral.

See Hydrofluoric.

A double salt of fluoric and phosphoric acids.

A double fluoride of silicon and some other (usually basic) element or radical, regarded as a salt of fluosilicic acid; -- called also silicofluoride.

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.

ce or mixture used to promote the fusion of metals or minerals, as alkalies, borax, lime, fluorite.

(Fraxinus) and along with esculin in the bark of the horse-chestnut. It shows a delicate fluorescence in alkaline solutions; -- called also paviin.

a metal, forms a haloid salt; especially, chlorine, bromine, and iodine; sometimes, also, fluorine and cyanogen. See Chlorine family, under Chlorine.

l, and now chiefly applied to the chlorides, bromides, iodides, and sometimes also to the fluorides and cyanides. -- n.

ound in the ejected masses of Vesuvius. It is a silicate of iron and magnesia, containing fluorine.

id containing hydrogen; -- sometimes applied to distinguish acids like hydrochloric, hydrofluoric, and the like, which contain no oxygen, from the oxygen acids or oxacids. See Acid.

A supposed compound of hydrofluoris acid and a base; a fluoride. [Archaic]

A salt of hydrofluosilic acid; a silicofluoride. See Silicofluoride.

Pertaining to, or denoting, a compound consisting of a double fluoride of hydrogen and silicon; silicofluoric. See Silicofluoric.