The Collaborative International Dictionary of English v.0.48:

Gregal \Gre"gal\, a. [L. gregalis, fr. grex, gregis, herd.]
   Pertaining to, or like, a flock.
   [1913 Webster]

         For this gregal conformity there is an excuse. --W. S.
                                                  Mayo.
   [1913 Webster]