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The combination of planes included under a general crystallographic symbol. It is not necessarily a closed solid.

The friar bird; -- so called from its cry, which resembles these words.

A compound or twin crystal consisting of four individuals.

A viverrine animal of Madagascar (Cryptoprocta ferox). It resembles a cat in size and form, and has retractile claws.

To separate by means of, or to subject to, fractional distillation or crystallization; to fractionate; -- frequently used with out; as, to fraction out a certain grade of oil from pretroleum.

small; inconsiderable; insignificant; as, a fractional part of the population. Fractional crystallization (Chem.), a process of gradual and approximate purification and separation, by means of repeated solution and crystallization therefrom. -- Fractional currency, small coin, or paper notes, in circulation, of less v…

lin, or a species (Rhamnus Frangula) of the buckthorn. Frangulinic acid (Chem.), a yellow crystalline substance, resembling alizarin, and obtained by the decomposition of frangulin.

A yellow crystalline dyestuff, regarded as a glucoside, extracted from a species (Rhamnus Frangula) of the buckthorn; -- called also rhamnoxanthin.

A colorless crystalline substance, regarded as a glucoside, and found in the bark of the ash (Fraxinus) and along with esculin in the bark of the horse-chestnut. It shows a delicate fluorescence in alkaline solutions; -- called also paviin.

A sulphide of antimony, lead, and silver, occuring in monoclinic crystals.

r (Physics), a philosophical instrument illustrating the freezing of water in a vacuum; a cryophous. -- Frost grape (Bot.), an American grape, with very small, acid berries. -- Frost lamp, a lamp placed below the oil tube of an Argand lamp to keep the oil limpid on cold nights; -- used especially in lighthouses. Knig…

circle in the sky attending frosty weather and formed by reflection of sunlight from ice crystals floating in the air; the parhelic circle whose center is at the zenith.

Full brother or sister, a brother or sister having the same parents as another. -- Full cry (Hunting), eager chase; -- said of hounds that have caught the scent, and give tongue together. -- Full dress, the dress prescribed by authority or by etiquette to be worn on occasions of ceremony. -- Full hand (Poker), thre…

and cyanuric acids, and designating an acid so called. Fulminuric acid (Chem.), a white, crystalline, explosive subatance, H3C3N3O3, forming well known salts, and obtained from the fulnunates. It is isomeric with cyanuric acid, and hence is also called isocyanuric acid.

umaric acid (Chem.), a widely occurring organic acid, exttracted from fumitory as a white crystallline substance, C2H2(CO2H)2, and produced artificially in many ways, as by the distillation of malic acid; boletic acid. It is found also in the lichen, Iceland moss, and hence was also called lichenic acid.…

An alkaloid extracted from fumitory, as a white crystalline substance.

A white, crystalline base, obtained indirectly from furfurol.

A yellow, crystalline substance, (C4H3O)2.C2O2, obtained by the oxidation of furoin. [Written also furil.]

A colorless, crystalline substance, C10H8O4, from furfurol.

corresponding fusion of creeds. C. Kingsley. Watery fusion (Chem.) the melting of certain crystals by heat in their own water of crystallization.