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An atom or radical which has a valence of eight, or is octavalent.

A fast of eight days before a great festival. Shipley.

A plane figure of eight sides and eight angles.

Having eight sides and eight angles.

Having eight pistils or styles; octogynous.

Having eight faces or sides; of, pertaining to, or formed in, octahedrons; as, octahedral cleavage. Octahedral borax (Chem.), borax obtained from a saturated solution in octahedral crystals, which contain five molecules of water of crystallization; distinguished from common or prismatic borax. -- Octahedral iron ore (…

A solid bounded by eight faces. The regular octahedron is contained by eight equal equilateral triangles.

Having the parts in eights; as, an octamerous flower; octamerous mesenteries in polyps.

A verse containing eight feet; as, -- Deep'' in|to'' the | dark''ness | peer''ing, | long'' I | stood'' there | wond'''ring, | fear''ing. Poe.

A Linnæan class of plants, in which the flowers have eight stamens not united to one another or to the pistil.

Of or pertaining to the Octandria; having eight distinct stamens.

Having eight angles; eight-angled. -- Oc*tan"gu*lar*ness, n.

The eighth part of a circle; an arc of 45 degrees.

in the 3d century, containing the Hebrew text and seven Greek versions of it, arranged in eight parallel columns.

A collection of eight books; especially, the first eight books of the Old Testament. [R.]

Having a valence of eight; capable of being combined with, exchanged for, or compared with, eight atoms of hydrogen; -- said of certain atoms or radicals.

The eighth day after a church festival, the festival day being included; also, the week following a church festival. "The octaves of Easter." Jer. Taylor.

A book composed of sheets each of which is folded into eight leaves; hence, indicating more or less definitely a size of book so made; -- usually written 8vo or 8º.

Happening every eighth year; also, lasting a period of eight years. Johnson. -- Oc*ten"ni*al*ly, adv.

A composition for eight parts, usually for eight solo instruments or voices.