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able of being replaced by basic radicals; -- said of certain acids; as, sulphuric acid is polybasic.

An iron-black ore of silver, consisting of silver, sulphur, and antimony, with some copper and arsenic.

A division of Nudibranchiata including those which have numerous branchiæ on the back.

A bromide containing more than one atom of bromine in the molecule.

Composed of several or numerous carpels; -- said of such fruits as the orange.

Bearing fruit repeatedly, or year after year.

One of the two principal groups of Chætopoda. It includes those that have prominent parapodia and fascicles of setæ. See Illust. under Parapodia.

A chloride containing more than one atom of chlorine in the molecule.

A government by many chiefs, princes, or rules. [Obs.] Cudworth.

Having many strings.

A medicine that serves for many uses, or that cures many diseases. [Obs.] Polychrest salt (Old Med. Chem.), potassium sulphate, specifically obtained by fusing niter with sulphur.

Same as Pleochroism.

The coloring matter of saffron; -- formerly so called because of the change of color on treatment with certain acids; -- called also crocin, and safranin.

A salt of a polychromic acid.

Showing a variety, or a change, of colors. Polychromatic acid (Old Chem.), a substance obtained by the action of nitric acid on aloes.

Executed in the manner of polychromy; as, polychrome printing.

Polychromatic.

Of or pertaining to polychromy; many-colored; polychromatic.

The art or practice of combining different colors, especially brilliant ones, in an artistic way.

Enduring through a long time; chronic.