sphenoid

== English == === Etymology === From New Latin sphenoides, from Ancient Greek σφηνοειδής (sphēnoeidḗs, “wedge-shaped”), from σφήν (sphḗn, “wedge”) +‎ -ειδής (-eidḗs, “-form, -like”). === Pronunciation === IPA(key): /ˈsfiː.nɔɪd/ Rhymes: -ɔɪd === Adjective === sphenoid (not comparable) Having a wedge shape. (anatomy) 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. ==== Derived terms ==== ==== Translations ==== === Noun === sphenoid (plural sphenoids) (anatomy) The sphenoid bone. (crystallography) A wedge-shaped crystal bounded by four equal isosceles triangles; the hemihedral form of a square pyramid. ==== Derived terms ==== ==== Translations ==== === References === “sphenoid”, in Lexico, Dictionary.com; Oxford University Press, 2019–2022. “sphenoid”, in Merriam-Webster.com Online Dictionary, Springfield, Mass.: Merriam-Webster, 1996–present. === Anagrams === diphones, siphoned