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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.