/ Dictionary / Index S sinew: Meaning and Definition of Find definitions for: sin•ew Pronunciation: (sin'y), [key] — n. a tendon. Often,the source of strength, power, or vigor: the sinews of the nation. strength; power; resilience: a man of great moral sinew. —v.t. to furnish with sinews; strengthen, as by sinews. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: sinew (Thesaurus) sine qua non sine wave 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