(computing, informal) Abbreviation of octal.

Alternative spelling of Oct.

(medicine) Initialism of optical coherence tomography: an optical signal acquisition and processing method that captures high-resolution three-dimensional images from biological tissues.

Abbreviation of October.

Form of octa- or octo- used before a vowel.

Initialism of One Country, Two Systems, the political structure by which Hong Kong and Macau are administered separately from mainland China. Chinese: 一國兩制／一国两制 (yī guó liǎng zhì).

plural of octacosane

(organic chemistry) Any of very many isomers of the aliphatic hydrocarbon having 28 carbon atoms, but especially n-octacosane CH₃(CH₂)₂₆CH₃

A brominated flame retardant with the molecular formula C₁₂H₂Br₈O.

Of or pertaining to octacosanoic acid or its derivatives; montanic