/ Dictionary / Index A anaerobic: Meaning and Definition of Find definitions for: an•aer•o•bic Pronunciation: (an"u-rō'bik, an"â-), [key] — adj. (of an organism or tissue) living in the absence of air or free oxygen. pertaining to or caused by the absence of oxygen. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: anaerobic (Thesaurus) anaerobe anaesthesia Related Content Daily Word Quiz: agitated Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language