Webster's Dictionary, 1913

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Polyacid adjective [ Poly- + acid .] (Chemistry) Capable of neutralizing, or of combining with, several molecules of a monobasic acid; having more than one hydrogen atom capable of being replaced by acid radicals; -- said of certain bases; as, calcium hydrate and glycerin are polyacid bases.

Polyacoustic adjective [ Poly- + acoustic : confer French polyacoustique .] Multiplying or magnifying sound. -- noun A polyacoustic instrument.

Polyacoustics noun The art of multiplying or magnifying sounds.

Polyacron noun ; plural Polyacra , English Polyacrons . [ New Latin , from Greek poly`s many + 'a`kron summit.] (Geom.) A solid having many summits or angular points; a polyhedron.

Polyactinia noun plural [ New Latin See Poly- , and Actinia .] (Zoology) An old name for those Anthozoa which, like the actinias, have numerous simple tentacles.

Polyadelphia noun plural [ New Latin , from Greek poly`s many + ... brother.] (Botany) A Linnæan class of plants having stamens united in three or more bodies or bundles by the filaments.

Polyadelphian, Polyadelphous adjective (Botany) Belonging to the class Polyadelphia; having stamens united in three or more bundles.

Polyandria noun plural [ New Latin See Polyandry .] (Botany) A Linnæan class of monoclinous or hermaphrodite plants, having many stamens, or any number above twenty, inserted in the receptacle.

Polyandrian adjective (Botany) Polyandrous.

Polyandric adjective [ Confer polyandrique .] Pertaining to, or characterized by, polyandry; mating with several males. " Polyandric societies." H. Spencer.

Polyandrous adjective (Botany) Belonging to the class Polyandria; having many stamens, or any number above twenty, inserted in the receptacle.

Polyandry noun [ Poly- + Greek ..., ..., man, male: confer French polyandrie .] The possession by a woman of more than one husband at the same time; -- contrasted with monandry .

» In law, this falls under the head of polygamy.

Polyanthus noun ; plural Polyanthuses . [ New Latin , from Greek ... rich in flowers; poly`s many + ... flower.] [ Written also polyanthos .] (Botany) (a) The oxlip. So called because the peduncle bears a many-flowered umbel. See Oxlip . (b) A bulbous flowering plant of the genus Narcissus ( N. Tazetta , or N. polyanthus of some authors). See Illust. of Narcissus .

Polyarchist noun One who advocates polyarchy; -- opposed to monarchist . Cudworth.

Polyarchy noun [ Poly- + -archy : confer French polyarchie. Confer Polarchy .] A government by many persons, of whatever order or class. Cudworth.

Polyatomic adjective [ Poly- + atomic .] (Chemistry) (a) Having more than one atom in the molecule; consisting of several atoms. (b) Having a valence greater than one. [ Obsolete]

Polyautography noun [ Poly- + autography .] The act or practice of multiplying copies of one's own handwriting, or of manuscripts, by printing from stone, -- a species of lithography.

Polybasic adjective [ Poly- + basic .] (Chemistry) Capable of neutralizing, or of combining with, several molecules of a monacid base; having several hydrogen atoms capable of being replaced by basic radicals; -- said of certain acids; as, sulphuric acid is polybasic .

Polybasite noun [ See Polybasic .] (Min.) An iron-black ore of silver, consisting of silver, sulphur, and antimony, with some copper and arsenic.

Polybranchia noun plural [ New Latin See Poly- , and Branchia .] (Zoology) A division of Nudibranchiata including those which have numerous branchiæ on the back.

Polybromide noun [ Poly- + bromide .] (Chemistry) A bromide containing more than one atom of bromine in the molecule.

Polycarpellary adjective (Botany) Composed of several or numerous carpels; -- said of such fruits as the orange.

Polycarpic, Polycarpous adjective [ Poly- + Greek ... fruit.] (Botany) (a) Bearing fruit repeatedly, or year after year. (b) Having several pistils in one flower.

Polychœrany noun [ Greek ..., from ... wide-ruling.] A government by many chiefs, princes, or rules. [ Obsolete] Cudworth.

Polychloride noun [ Poly- + chloride .] (Chemistry) A chloride containing more than one atom of chlorine in the molecule.

Polychord adjective [ Greek ...; poly`s many + ... string, cord.] Having many strings.

Polychord noun (Mus.) (a) A musical instrument of ten strings. (b) An apparatus for coupling two octave notes, capable of being attached to a keyed instrument.

Polychrest noun [ Greek ... useful for many purposes; poly`s many + ... useful, from ... to use: confer French polychreste .] (Medicine) A medicine that serves for many uses, or that cures many diseases. [ Obsolete]

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

Polychroism noun [ Poly- + Greek ... color.] Same as Pleochroism .

Polychroite noun [ Poly- + Greek ... color: confer French polychroïte .] (Chemistry) The coloring matter of saffron; -- formerly so called because of the change of color on treatment with certain acids; -- called also crocin , and safranin .

Polychromate noun [ See Polychromic .] (Chemistry) A salt of a polychromic acid.

Polychromatic adjective [ 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.

Polychrome noun [ Poly- + Greek ... color.] (Chemistry) Esculin; -- so called in allusion to its fluorescent solutions. [ R.]

Polychrome adjective [ Confer French polychrome .] Executed in the manner of polychromy; as, polychrome printing.

Polychromic adjective [ Poly- + (sense 1) Greek ..., or (sense 2) chromic .]
1. Polychromatic.

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

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

Polychromy noun [ Poly- + Greek ... color.] (Anc. Art) The art or practice of combining different colors, especially brilliant ones, in an artistic way.

Polychronious adjective [ Poly- + Greek ... for a long time, ... time.] Enduring through a long time; chronic.

Polychæta noun plural [ New Latin , from Greek poly`s many + ... hair.] (Zoology) One of the two principal groups of Chætopoda. It includes those that have prominent parapodia and fascicles of setæ. See Illust. under Parapodia .

Polyclinic noun [ Poly- + clinic .] (Medicine) A clinic in which diseases of many sorts are treated; especially, an institution in which clinical instruction is given in all kinds of disease.

Polyconic adjective [ Poly- + conic .] Pertaining to, or based upon, many cones.

Polyconic projection (Map Making) , a projection of the earth's surface, or any portion thereof, by which each narrow zone is projected upon a conical surface that touches the sphere along this zone, the conical surface being then unrolled. This projection differs from conic projection in that latter assumes but one cone for the whole map. Polyconic projection is that in use in the United States coast and geodetic survey.

Polycotyledon noun [ Poly- + cotyledon : confer French polycotylédone .] (Botany) A plant that has many, or more than two, cotyledons in the seed. -- Pol`y*cot`y*led"on*ous adjective

Polycotyledonary adjective [ Poly- + cotyledonary .] (Anat.) Having the villi of the placenta collected into definite patches, or cotyledons.

Polycracy noun [ Poly- + -cracy , as in democracy .] Government by many rulers; polyarchy.

Polycrotic (pŏl`ĭ*krŏt"ĭk) adjective [ Poly- + Greek krotei^n to beat.] (Physiol.) Of or pertaining to polycrotism; manifesting polycrotism; as, a polycrotic pulse; a polycrotic pulse curve.

Polycrotism noun (Physiol.) That state or condition of the pulse in which the pulse curve, or sphygmogram, shows several secondary crests or elevations; -- contrasted with monocrotism and dicrotism .

Polycystid noun (Zoology) (a) One of the Polycystidea. (b) One of the Polycystina. -- adjective Pertaining to the Polycystidea, or the Polycystina.

Polycystidea noun plural [ New Latin See Poly- , and Cystidea .] (Zoology) A division of Gregarinæ including those that have two or more internal divisions of the body.

Polycystina noun plural [ New Latin See Poly- , and Cyst .] (Zoology) A division of Radiolaria including numerous minute marine species. The skeleton is composed of silica, and is often very elegant in form and sculpture. Many have been found in the fossil state.