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Sphenoid

//ˈsfiː.nɔɪd// adj, noun

Definitions

Adjective
  1. 1
    Having a wedge shape. not-comparable
  2. 2
    Of or relating to the sphenoid bone which forms the base of the cranium, behind the eye and below the front part of the brain. It has two pairs of broad lateral ‘wings’ and a number of other projections, and contains two air-filled sinuses. not-comparable
Noun
  1. 1
    The sphenoid bone.
  2. 2
    butterfly-shaped bone at the base of the skull wordnet
  3. 3
    A wedge-shaped crystal bounded by four equal isosceles triangles; the hemihedral form of a square pyramid.

Etymology

Etymology 1

From New Latin sphenoides, from Ancient Greek σφηνοειδής (sphēnoeidḗs, “wedge-shaped”), from σφήν (sphḗn, “wedge”) + -ειδής (-eidḗs, “-form, -like”).

Etymology 2

From New Latin sphenoides, from Ancient Greek σφηνοειδής (sphēnoeidḗs, “wedge-shaped”), from σφήν (sphḗn, “wedge”) + -ειδής (-eidḗs, “-form, -like”).

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