plural of octane number

(organic chemistry) The saturated aliphatic hydrocarbon (CH₃(CH₂)₆CH₃).

plural of iso-octane

(of fuel) Having a low octane number. / (by extension) Slow; weak.

An octane number, used by the American Society for Testing and Materials to estimate the antiknock characteristics of a fuel at low engine speeds

plural of research octane number

The eighth part of a circle; an arc of 45 degrees. / (astrology) The aspect of two planets that are 45°, or one-eighth of a circle, apart.

plural of octant

(biochemistry) Any monosaccharide having the configuration of an eight-membered ring.

(organic chemistry, especially in combination) The univalent radical derived from octanoic acid by loss of the hydroxy group; capryloyl