(organic chemistry) The saturated aliphatic aldehyde having eight carbon atoms

A fever that recurs every eight days.

Occurring every eight days.

(organic chemistry) Any of the eighteen isomeric aliphatic hydrocarbons (C₈H₁₈) found in petroleum, especially an iso-octane 2,2,4 trimethyl-pentane; they are used as fuels and solvents.

(astronomy) A small circumpolar constellation of the southern sky, said to resemble an octant. It lies closest to the southern celestial pole of any constellation.

plural of octan

plural of octane

plural of octane number

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

A measure of the antiknock properties of an automobile fuel; isooctane having an octane number of 100, a fuel with the same antiknock properties as a mixture of 90% isooctane and 10% heptane having an octane number of 90.