octad | (noun) the cardinal number that is the sum of seven and one | Synonyms: 8, eight, eighter, eighter from Decatur, octet, octonary, ogdoad, VIII |
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octagon | (noun) an eight-sided polygon | - |
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octahedron | (noun) any polyhedron having eight plane faces | - |
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octameter | (noun) a verse line having eight metrical feet | - |
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octane | (noun) any isomeric saturated hydrocarbon found in petroleum and used as a fuel and solvent | - |
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octant | (noun) a measuring instrument for measuring angles to a celestial body; similar to a sextant but with 45 degree calibration | - |
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octave | (noun) a musical interval of eight tones | Synonyms: musical octave |
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(noun) a rhythmic group of eight lines of verse | - |
(noun) a feast day and the seven days following it | - |
octavo | (noun) the size of a book whose pages are made by folding a sheet of paper three times to form eight leaves | Synonyms: 8vo, eightvo |
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