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.

(||Hep`ta*gyn"i*a) n. pl. [NL., fr. Gr. "epta` seven + woman, female: cf. F. heptagunie.] (Bot.) A Linnæan order of plants having seven pistils.

(Hep`ta*gyn"i*an Hep*tag"y*nous) a. [Cf. F. heptagyne.] (Bot.) Having seven pistils.

(Hep`ta*he"dron) n. [Hepta- + Gr. seat, base, fr. to sit: cf. F. heptaèdre.] (Geom.) A solid figure with seven sides.

(Hep*tam"er*ous) a. [Hepta- + Gr. part.] (Bot.) Consisting of seven parts, or having the parts in sets of sevens. Gray.

(||Hep*tan"dri*a) n. pl. [NL., fr. Gr. "epta` seven + man, male: cf. F. heptandrie.] (Bot.) A Linnæan class of plants having seven stamens.

(Hep*tan"dri*an Hep*tan"drous) a. [Cf. F. heptandre.] (Bot.) Having seven stamens.

(Hep"tane) n. [Gr. "epta` seven.] (Chem.) Any one of several isometric hydrocarbons, C7H16, of the paraffin series (nine are possible, four are known); — so called because the molecule has seven

(Hep"a*to-pan"cre*as) n. [Gr. "h^par, "h`patos, the liver + E. pancreas.] (Zoöl.) A digestive gland in Crustacea, Mollusca, etc., usually called the liver, but different from the liver of vertebrates.

(Hep`a*to*re"nal) a. [Hepatic + renal.] (Anat.) Of or pertaining to the liver and kidneys; as, the hepatorenal ligament.

(Hep`a*tos"co*py) n. [Gr. fr. "h^par, "h`patos, the liver + to view: cf. F. hépatoscopie.] Divination by inspecting the liver of animals.

(Hep"pen) a. [Cf. AS. gehæp fit, Icel. heppinn lucky, E. happy.] Neat; fit; comfortable. [Obs.]

(Hep"per) n. [Etymol. uncertain.] (Zoöl.) A young salmon; a parr.

(Hep"ta) [See Seven.] A combining form from Gr. "epta`, seven.

(Hep"ta*chord) n. [Gr. "epta`xordos seven-stringed; "epta` seven + xordh` chord: cf. F. heptacorde. See Seven, and Chord.]

1. (Anc. Mus.) (a) A system of seven sounds. (b) A lyre with seven chords.

2. (Anc. Poet.) A composition sung to the sound of seven chords or tones. Moore (Encyc. of Music).

(Hep"tad) n. [L. heptas the number seven. Gr. fr. "epta` seven.] (Chem.) An atom which has a valence of seven, and which can be theoretically combined with, substituted for, or replaced by, seven monad atoms or radicals; as, iodine is a heptad in iodic acid. Also used as an adjective.

(Hep"tade) n. [Cf. F. heptade. See Heptad.] The sum or number of seven.

(Hep"ta*glot) n. [Gr. "epta` seven + 3, tongue, language.] A book in seven languages.

(Hep"ta*gon) n. [Gr. sevencornered; "epta` seven + angle: cf. F. heptagone.] (Geom.) A plane figure consisting of seven sides and having seven angles.

(Hep*tag"o*nal) a. [Cf. F. heptagonal.] Having seven angles or sides.

  By PanEris using Melati.

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