Fluor

flōō′or, n. a mineral often described as chemically fluate of lime, but really calcium fluoride, found abundantly in Derby shire—also Flu′or-spar , Flu′orite .— ns. Fluores′cein , a coal-tar product, little used in dyeing, the colour not being fast; Fluores′cence , a peculiar blue appearance exhibited by certain substances exposed to sunlight, and especially observable in a dilute solution of sulphate of quinine.— adjs. Fluores′cent , having the property of fluorescence; Fluor′ic .— ns. Flu′oride , a binary compound of fluorine with another element; Flu′orine , an elementary substance allied to chlorine, obtained chiefly from fluor; Flu′orotype , a photographic proce in which salts of fluoric acid were employed for the purpose of producing images in the camera; Fluosil′icate , a compound of fluosilicic acid with some base.— adj. Fluosilic′ic , composed of silicon and fluorine. [A name given by the alchemists to all mineral acids because of their fluidity , from L. fluĕre , to flow.]