/ Dictionary / Index A abacterial: Meaning and Definition of Find definitions for: a•bac•te•ri•al Pronunciation: (ā"bak-tēr'ē-ul), [key] — adj. not caused by or free from the presence of bacteria. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Abaco abaculus Related Content Daily Word Quiz: frugal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language