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.

Source: Webster's Revised Unabridged Dictionary (1913)