| octane | (n) any isomeric saturated hydrocarbon found in petroleum and used as a fuel and solvent |
| octane number | (n) a measure of the antiknock properties of gasoline, Syn. octane rating |
| octangular | (adj) of or relating to or shaped like an octagon, Syn. octagonal |
| octans | (n) the constellation that includes the southern celestial pole |
| octant | (n) a measuring instrument for measuring angles to a celestial body; similar to a sextant but with 45 degree calibration |
| octander | n. One of the |
| Octandria | ‖prop. n. pl. [ NL., fr. Gr. |
| octandrous | |
| octane | n. [ See Octa- ] (Chem.) Any one of a group of metametric hydrocarbons ( |
| Octangular | a. [ L. octangulus eight-cornered; octo eight + angulus angle. ] Having eight angles; eight-angled. -- |
| Octant | n. [ L. octans, -antis. fr. octo eight. See Octave. ] |
| octanucleotide | n. [ Octa- + nucleotide. ] (Chem.) A molecule composed of eight nucleotide units bound to each other by phosphodiester bonds in a linear array; |