The Collaborative International Dictionary of English v.0.48:

Interosseal \In`ter*os"se*al\, Interosseous \In`ter*os"se*ous\,
   a. [Pref. inter- + osseous: cf. F. interosseux.] (Anat.)
   Situated between bones; as, an interosseous ligament.
   [1913 Webster]