/ Dictionary / Index S silly-sider: Meaning and Definition of Find definitions for: sil•ly-sid•er Pronunciation: (sil'ē-sī"dur), [key] — n. Canadian Slang. a left-handed person. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. silly season sillyweed 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