3. -s an endingmarking nouns as plural (weeks; days; minutes), occurring also on nouns that have no singular (dregs; pants; scissors), or on nouns that have a singular with a different meaning (glasses; manners; thanks); -s3 occurs with a number of nouns that now often takesingular agreement, as the names of games (billiards; checkers), of diseases (measles; rickets), or of various involuntary physical or mental conditions (d.t.'s; giggles; hots; willies). A parallel set of formations, where -s3 has no plural value, are adjectives denoting mental states (bananas; crackers; nuts);
4. -s a suffix of hypocoristic nouns, generally proper names or forms used only in address: Babs; Fats; Suzykins; Toodles.
Etymology: (prob. from the metonymic use of nouns formed with -s3, as boots or Goldilocks)
Definition of '-s'
Webster Dictionary
1. -s the suffix used to form the plural of most words; as in roads, elfs, sides, accounts
Definitions of -s 
