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Definition of: sphenoid
(sfē′noid) noun
1. Mineral. In the tetragonal and orthorhombic crystal systems, a hemihedral form enclosed by four faces, each of which cuts all three axes.
2. The sphenoid bone.
—adjective Wedge–shaped: the sphenoid bone. [<SPHEN(O)- + -OID]
—sphe·noi·dal (sfi·noid′l) adjective
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