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y), meaning pertaining to, or derived from, a series of compounds containing a radical of two nitrogen atoms, united usually to an aromatic radical; as, diazo- benzene, C6H5.N2.OH.

Having two acid hydrogen atoms capable of replacement by basic atoms or radicals, in forming salts; bibasic; -- said of acids, as oxalic or sulphuric acids. Cf. Diacid, Bibasic.

An order of cephalopods which includes those with two gills, an apparatus for emitting an inky fluid, and either eight or ten cephalic arms bearing suckers or hooks, as the octopi and squids. See Cephalopoda.

Having two gills. -- n.

rocarbon, C8H18, of the marsh-gas series, being one of several octanes, and consisting of two butyl radicals. Cf. Octane.

Having two atoms or equivalents of calcium to the molecule.

Containing two carbon residues, or two carboxyl or radicals; as, oxalic acid is a dicarbonic acid.

A genus of herbaceous plants, with racemes of two-spurred or heart-shaped flowers, including the Dutchman's breeches, and the more showy Bleeding heart (D. spectabilis). [Corruptly written dielytra.]

Having two heads on one body; double-headed.

Having two coverings, a calyx and in corolla.

To cut into two parts; to part into two divisions; to divide into pairs; to bisect. [R.] The apostolical benediction dichotomizes all good things into grace and peace. Bp. Hall.

A cutting in two; a division. A general breach or dichotomy with their church. Sir T. Browne.

The property of presenting different colors by transmitted light, when viewed in two different directions, the colors being unlike in the direction of unlike or unequal axes.

Iolite; -- so called from its presenting two different colors when viewed in two different directions. See Iolite.

A salt of chromic acid containing two equivalents of the acid radical to one of the base; -- called also bichromate.

Having or exhibiting two colors.

Furnishing or giving two colors; -- said of defective vision, in which all the compound colors are resolvable into two elements instead of three. Sir J. Herschel.

Having two of the intersections between the three axes oblique. See Crystallization.

Composed pf two coherent, one-seeded carpels; as, a dicoccous capsule.

A plant whose seeds divide into two seed lobes, or cotyledons, in germinating.