/ Dictionary / Index S sizy: Meaning and Definition of Find definitions for: siz•y Pronunciation: (sī'zē), [key] — siz•i•er, siz•i•est. thick; viscous. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. sizing sizzle Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language