/ Dictionary / Index A abaculus: Meaning and Definition of Find definitions for: a•bac•u•lus Pronunciation: (u-bak'yu-lus), [key] — pl. -li abaciscus. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. abacterial abacus Related Content Daily Word Quiz: lyceum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language