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A combining form from Gr. "epta`, seven.

A system of seven sounds.

ned with, substituted for, or replaced by, seven monad atoms or radicals; as, iodine is a heptad in iodic acid. Also used as an adjective.

The sum or number of seven.

A book in seven languages.

A plane figure consisting of seven sides and having seven angles.

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.

A Linnæan order of plants having seven pistils.

Having seven pistils.

A solid figure with seven sides.

Consisting of seven parts, or having the parts in sets of sevens. Gray.

A Linnæan class of plants having seven stamens.

Having seven stamens.

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.

Having seven angles.

Having seven leaves.

Same as Heptarchist.

Of or pertaining to a heptarchy; constituting or consisting of a heptarchy. T. Warton.

A ruler of one division of a heptarchy. [Written also heptarch.]

A government by seven persons; also, a country under seven rulers.