Polychrest salt(Old Med. Chem.), potassium sulphate, specifically obtained by fusing niter with sulphur.

(Pol"y*chro*ism) n. [Poly- + Gr. color.] Same as Pleochroism.

(Pol"y*chro*ite) n. [Poly- + Gr. color: cf. F. polychroïte.] (Chem.) The coloring matter of saffron; — formerly so called because of the change of color on treatment with certain acids; — called also crocin, and safranin.

(Pol`y*chro"mate) n. [See Polychromic.] (Chem.) A salt of a polychromic acid.

(Pol`y*chro"mate), n. [See Polychromatic.] (Chem.) A compound which exhibits, or from which may be prepared, a variety of colors, as certain solutions derived from vegetables, which display colors by fluorescence.

(Pol`y*chro*mat"ic) a. [Poly- + chromatic.] Showing a variety, or a change, of colors.

Polychromatic acid(Old Chem.), a substance obtained by the action of nitric acid on aloes.

(Pol"y*chrome) n. [Poly- + Gr. color.] (Chem.) Esculin; — so called in allusion to its fluorescent solutions. [R.]

(Pol"y*chrome), a. [Cf. F. polychrome.] Executed in the manner of polychromy; as, polychrome printing.

(Pol`y*chro"mic) a. [Poly- + (sense 1) Gr. or (sense 2) chromic.]

1. Polychromatic.

2. (Chem.) Pertaining to, or designating, any one of several acids (known only in their salts) which contain more than one atom of chromium.

(Pol`y*chro"mous) a. Of or pertaining to polychromy; many-colored; polychromatic.

(Pol"y*chro`my) n. [Poly- + Gr. color.] (Anc. Art) The art or practice of combining different colors, especially brilliant ones, in an artistic way.

Polycarpic to Polyhymnia

(Pol`y*car"pic Pol`y*car"pous) a. [Poly- + Gr. fruit.] (Bot.) (a) Bearing fruit repeatedly, or year after year. (b) Having several pistils in one flower.

(||Pol`y*chæ"ta) n. pl. [NL., from Gr. poly`s many + hair.] (Zoöl.) One of the two principal groups of Chætopoda. It includes those that have prominent parapodia and fascicles of setæ. See Illust. under Parapodia.

(Pol`y*chlo"ride) n. [Poly- + chloride.] (Chem.) A chloride containing more than one atom of chlorine in the molecule.

(Pol`y*chœr"a*ny) n. [Gr. fr. wide-ruling.] A government by many chiefs, princes, or rules. [Obs.] Cudworth.

(Pol"y*chord) a. [Gr. poly`s many + string, cord.] Having many strings.

(Pol"y*chord), n. (Mus.) (a) A musical instrument of ten strings. (b) An apparatus for coupling two octave notes, capable of being attached to a keyed instrument.

(Pol"y*chrest) n. [Gr. useful for many purposes; poly`s many + useful, fr. to use: cf. F. polychreste.] (Med.) A medicine that serves for many uses, or that cures many diseases. [Obs.]

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