n. a colourless inflammable hydrocarbon of the alkane series. °Chem. formula: C
[ 8 ]
H
[ 18 ]
. high-octane (of fuel used in internal-combustion engines) having good antiknock properties, not detonating readily during the power stroke. octane number (or rating) a figure indicating the antiknock properties of a fuel.
[ OCT- + -ANE ]