| octan | any isomeric saturated hydrocarbon found in petroleum and used as a fuel and solvent |
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| octan | a measure of the antiknock properties of gasoline |
| octan | a measure of the antiknock properties of gasoline |
| octan | a dicarboxylic acid found in cork |
| octan | of or relating to or shaped like an octagon |
| octan | the constellation that includes the southern celestial pole |
| octan | a measuring instrument for measuring angles to a celestial body |