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A crystalline nitrogenous base, C10H8N2, obtained by the reduction of pyridine.

red rays, arising from their different refrangibilities. Dispersion of the optic axes (Crystallog.), the separation of the optic axes in biaxial crystals, due to the fact that the axial angle has different values for the different colors of the spectrum.

Toward a distal part; on the distal side of; distally.

A white, crystalline, aromatic hydrocarbon, C14H14, consisting of two radicals or residues of toluene.

h; -- also called tooth ornament. Dogtooth spar (Min.), a variety of calcite, in acute crystals, resembling the tooth of a dog. See Calcite. -- Dogtooth violet (Bot.), a small, bulbous herb of the Lily family (genus Erythronium). It has two shining flat leaves and commonly one large flower. [Written also dog's-tooth v…

ng of the carbonate of lime and magnesia in varying proportions. It occurs in distinct crystals, and in extensive beds as a compact limestone, often crystalline granular, either white or clouded. It includes much of the common white marble. Also called bitter spar.

A counterfeit gem, composed of two pieces of crystal, with a color them, and thus giving the appearance of a naturally colored gem. Also, a piece of paste or glass covered by a veneer of real stone.

A dipterous insect (Eristalis tenax), resembling the drone bee. See Eristalis.

A cavity in a rock, having its interior surface studded with crystals and sometimes filled with water; a geode.

Covered with a large number of minute crystals.

A colorless, crystalline, aromatic hydrocarbon, C6H2(CH3)4, off artificial production, with an odor like camphor.

Without bracteoles, or little bracts; -- said of a pedicel or flower stalk.

A colorless, crystalline, nitrogenous base, obtained by the decomposition of cocaine.

A grayish white zeolitic mineral, in tetragonal crystals. It is a hydrous silicate of alumina and baryta.

A group of Crustacea in which the eyes are without stalks; the Arthrostraca. [Written also Edriophthalmata.]

To change on the surface, or throughout, to a whitish, mealy, or crystalline powder, from a gradual decomposition, esp. from the loss of water, on simple exposure to the air; as, Glauber's salts, and many others, effloresce.

A compound or twin crystal made up of eight individuals.

of double refraction and their relation to the elastic force of the luminous ether in crystalline media.

ly Motordica Elaterium) and other related species. It is extracted as a bitter, white, crystalline substance, which is a violent purgative.

ansparent, colorless oil obtained from elemi resin by distillation with water; also, a crystallizable extract from the resin.