/ Dictionary / Index A Attalus I: Meaning and Definition of Find definitions for: At•ta•lus I Pronunciation: (at'l-us), [key] — (Soter) king of Pergamum 241–197 b.c. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Attalid Attalus II Related Content Daily Word Quiz: abstain Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language