sphenoid adjective & noun. ['sfi:nɔɪd] M18.
[mod. Latin spheno(e)ides from Greek sphēnoeidēs, from sphēn wedge: see -OID.]
A. adjective. Designating, of, or pertaining to a bone of irregular shape situated at the base of the skull, in front of the temporal and occipital bones. M18.
b. noun.
1. Anatomy & Zoology. The sphenoid bone; each of the separate parts of this. E19.

2. Crystallography. A long wedge-shaped prismatic crystal form of the sphenoidal class. Also = DISPHENOID. M19.

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