mastoidal(n = noun.body) mastoid, mastoid bone, mastoid process - process of the temporal bone behind the ear at the base of the skull;
is a kind of appendage, outgrowth, process
is a part of os temporale, temporal bone
has parts: mastoidale

   mastoidal(a = adj.pert) mastoid - relating to or resembling a nipple;

   Same as Mastoid. [1913 Webster]