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Having but one series of stamens, and that equal in number to the proper number of petals; isostemonous.

ately simple harmonic motion. -- Harmonic proportion. See under Proportion. -- Harmonic series or progression. See under Progression. -- Spherical harmonic analysis, a mathematical method, sometimes referred to as that of Laplace's Coefficients, which has for its object the expression of an arbitrary, periodic funct…

A musical instrument, consisting of a series of hemispherical glasses which, by touching the edges with the dampened finger, give forth the tones.

One of a series of playing cards, distinguished by the figure or figures of a heart; as, hearts are trumps.

A white, semisolid, spermaceti-like hydrocarbon, C16H34, of the paraffin series, found dissolved as an important ingredient of kerosene, and so called because each molecule has sixteen atoms of carbon; -- called also hexadecane.

taining to, or derived from, the ivy (Hedera); as, hederic acid, an acid of the acetylene series.

A hydrocarbon, C11H24, of the paraffin series; -- so called because it has eleven atoms of carbon in each molecule. Called also endecane, undecane.

Having seven angles or sides. Heptagonal numbers (Arith.), the numbers of the series 1, 7, 18, 34, 55, etc., being figurate numbers formed by adding successively the terms of the arithmetical series 1, 6, 11, 16, 21, etc.

Any one of several isometric hydrocarbons, C7H16, of the paraffin series (nine are possible, four are known); -- so called because the molecule has seven carbon atoms. Specifically, a colorless liquid, found as a constituent of petroleum, in the tar oil of cannel coal, etc.

Any one of a series of unsaturated metameric hydrocarbons, C7H12, of the acetylene series.

A liquid hydrocarbon, C7H10, of the valylene series.

A compound radical, C7H15, regarded as the essential radical of heptane and a related series of compounds.

A colorless liquid hydrocarbon, C7H14, of the ethylene series; also, any one of its isomers. Called also heptene.

sting between derivatives of the same substance, or of the analogous members of different series; as, ethane, ethyl alcohol, acetic aldehyde, and acetic acid are in heterology with each other, though each in at the same time a member of a distinct homologous series. Cf. Homology.

A series of six notes, with a semitone between the third and fourth, the other intervals being whole tones.

A series of six numbers.

Any one of five hydrocarbons, C6H14, of the paraffin series. They are colorless, volatile liquids, and are so called because the molecule has six carbon atoms.

A hydrocarbon, C6H10, of the acetylene series, obtained artificially as a colorless, volatile, pungent liquid; -- called also hexoylene.

A liquid hydrocarbon, C6H8, of the valylene series, obtained from distillation products of certain fats and gums.

A compound radical, C6H13, regarded as the essential residue of hexane, and a related series of compounds.