/ Dictionary / Index O octavus*: Meaning and Definition of Find definitions for: oc•ta•vus Pronunciation: (ōk-tä'woos Eng. ok-tā'v&schwas), [key] — adj. Latin. eighth. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. octavo octennial Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language