/ Dictionary / Index O octan: Meaning and Definition of Find definitions for: oc•tan Pronunciation: (ok'tun), [key] — adj. (of a fever) occurring every eighth day. —n. an octan fever. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. octameter octane Related Content Daily Word Quiz: rustic Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language