Vocabulary : Octa- to Octahedrite

Octa- : A prefix meaning eight. See Octo-. ;; A combining form meaning eight; as in octodecimal, octodecimal, octolocular.
Octachord : An instrument of eight strings; a system of eight tones.
Octad : An atom or radical which has a valence of eight, or is octavalent.
Octaedral : See Octahedral.
Octaemeron : A fast of eight days before a great festival.

Octagon : A plane figure of eight sides and eight angles. ;; Any structure (as a fortification) or place with eight sides or angles.
Octagonal : Having eight sides and eight angles.
Octagynous : Having eight pistils or styles; octogynous.
Octahedral : Having eight faces or sides; of, pertaining to, or formed in, octahedrons; as, octahedral cleavage.
Octahedrite : Titanium dioxide occurring in acute octahedral crystals.

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