Source : Webster's Revised Unabridged Dictionary (1913)

Coccygeal \Coc*cyg"e*al\, a. (Anat.)
   Of or pertaining to the coccyx; as, the coccygeal
   vertebr[ae].

   {Coccygeal glands} (Zo["o]l.), glands situated at the base of
      the tail of birds. They secrete the oil with which the
      plumage is dressed.