Source : Webster's Revised Unabridged Dictionary (1913)

Head gear \Head" gear`\, or Headgear \Head"gear`\, n.
   1. Headdress.

   2. Apparatus above ground at the mouth of a mine or deep
      well.

Source : WordNet®

headgear
     n 1: clothing for the head [syn: {headdress}]
     2: the hoist at the pithead of a mine
     3: stable gear consisting of any part of a harness that fits
        about the horse's head