Noun

1. A male person.
   • 1922, P. G. Wodehouse, Right Ho, Jeeves, ch. 19,

     You are a silly young geezer.

2. An old person, usually a male.
   • 2000, Moira McDonald, "Outakes," Seattle Times, 25 Aug. (retrieved 6 Sep. 2008),

     The technical term for a female geezer is "old broad," but this is irrelevant, as nobody in Hollywood makes films about women over 55.

3. A device for boiling water for such domestic uses as heating or washing; a boiler. The normal spelling is water .