/ Dictionary / Index S senega: Meaning and Definition of Find definitions for: sen•e•ga Pronunciation: (sen'i-gu), [key] — n. the dried root of a milkwort, Polygala senega, of the eastern U.S., used as an expectorant and diuretic. the plant itself. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: senega (Thesaurus) Senefelder Senegal Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language