The Collaborative International Dictionary of English v.0.48:

Wormian \Wor"mi*an\, a. (Anat.)
   Discovered or described by Olanus Wormius, a Danish
   anatomist.
   [1913 Webster]

   Wormian bones, small irregular plates of bone often
      interposed in the sutures between the large cranial bones.
      [1913 Webster]