scapulas

from The Collaborative International Dictionary of English v.0.48

Scapula \Scap"u*la\ (sk[a^]p"[-u]*l[.a]), n.; pl. L. {Scapulae},
   E. {Scapulas}. [L.]
   1. (Anat.) The principal bone of the shoulder girdle in
      mammals; the shoulder blade.
      [1913 Webster]

   2. (Zool.) One of the plates from which the arms of a crinoid
      arise.
      [1913 Webster]