/ Dictionary / Index S sinusoidal: Meaning and Definition of Find definitions for: si•nus•oi•dal Pronunciation: (sī"nu-soid'l), [key] — adj. of or pertaining to a sinusoid. having a magnitude that varies as the sine of an independent variable: a sinusoidal current. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: sinusoidal (Thesaurus) sinusoid sinusoidal projection Related Content Daily Word Quiz: ounterfeit Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language