(n) the irregularly shaped area on either side of the cranium where the frontal bone and the anterior tip of the parietal bone and the temporal bone and the greater wing of the sphenoid bone meet; corresponds to the pterion when bones have ossified, Syn. sphenoidal fontanelle, sphenoidal fontanel, sphenoid fontanel
a. [ Gr. &unr_;&unr_;&unr_;; sfh`n a wedge + e'i^dos form: cf. F. sphénoïde. ] 1. Wedge-shaped; as, a sphenoid crystal. [ 1913 Webster ]
2. (Anat.) Of or pertaining to the sphenoid bone. [ 1913 Webster ]
Sphenoid bone (Anat.), an irregularly shaped bone in front of the occipital in the base of the skull of the higher vertebrates. It is composed of several fetal bones which become united the adult. See Alisphenoid, Basisphenoid, Orbitosphenoid, Presphenoid. [ 1913 Webster ]
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