/ Dictionary / Index S scalenus: Meaning and Definition of Find definitions for: sca•le•nus Pronunciation: (skā-lē'nus), [key] — pl. -ni any of three muscles on each side of the neck, the action of which raises the first and second ribs in respiration and assists in bending the neck to one side. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: scalenus (Thesaurus) scalenohedron scalepan Related Content Daily Word Quiz: hedonist Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language