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]

WordNet (r) 3.0 (2006):

scapula
    n 1: either of two flat triangular bones one on each side of the
         shoulder in human beings [syn: scapula, shoulder blade,
         shoulder bone]