/ Dictionary / Index S sizer: Meaning and Definition of Find definitions for: siz•er Pronunciation: (sī'zur), [key] — n. any device for measuring or sorting objects according to size. a worker who judges or sorts objects according to size. siz•er Pronunciation: (sī'zur), [key] — n. sizar. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: sizer (Thesaurus) sized size-up 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