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From The Collaborative International Dictionary of English v.0.48:
Orbitosphenoid \Or`bi*to*sphe"noid\, a. [Orbit + sphenoid.] (Anat.) Of or pertaining to the sphenoid bone and the orbit, or to the orbitosphenoid bone. -- n. The orbitosphenoid bone, which is situated in the orbit on either side of the presphenoid. It generally forms a part of the sphenoid in the adult. [1913 Webster]