D defs.my
Entry 3 senses Webster, 1913

hickey

· hick·ey · IPA /ˈhɪk.i/
01 n. A device used to adapt a lighting fixture for mounting in an outlet box, or on a pipe.
  1. 1.
    A device used to adapt a lighting fixture for mounting in an outlet box, or on a pipe.(Elec.)
  2. 2.
    A red mark on the skin, caused by a passionate, sucking kiss at that location.[slang]
  3. 3.
    a doohickey.[informal] See: doohickey