A bone at the base of the skull that is of a most irregular shape. The sphenoid bone consists of a central portion, (the body of the sphenoid) and six processes: two greater wings, two lesser wings and two pterygoid processes. The sphenoid bone articulates (joins) with a number of other bones (the occipital, frontal, ethmoid, and vomer, and with the paired temporal, parietal, zygomatic, palatine and sphenoidal concha bones).
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1. SYN: sphenoidal. 2. SYN: s. (bone). [G. sphenoeides, fr. sphen, wedge, + eidos, resemblance]

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sphe·noid 'sfē-.nȯid or sphe·noi·dal sfē-'nȯid-əl adj of, relating to, or being a compound bone of the base of the cranium of various vertebrates formed by the fusion of several bony elements with the basisphenoid and in humans consisting of a median body from whose sides extend a pair of broad curved winglike expansions in front of which is another pair of much smaller triangular lateral processes while ventrally two large deeply cleft processes extend downward see GREATER WING, LESSER WING
sphenoid n a sphenoid bone

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sphe·noid (sfeґnoid) [sphen- + -oid] 1. wedge-shaped; see os sphenoidale. 2. sphenoidal.

Medical dictionary. 2011.

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  • Sphenoid — Sphe noid, a. [Gr. ???; sfh n a wedge + e i^dos form: cf. F. sph[ e]no[ i]de.] 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 …   The Collaborative International Dictionary of English

  • Sphenoid — Sphe noid, n. 1. (Crystallog.) A wedge shaped crystal bounded by four equal isosceles triangles. It is the hemihedral form of a square pyramid. [1913 Webster] 2. (Anat.) The sphenoid bone. [1913 Webster] …   The Collaborative International Dictionary of English

  • sphenoid — [sfē′noid΄] adj. [ModL sphenoides < Gr sphēnoeides: see SPHENE & OID] 1. wedge shaped 2. Anat. designating or of the wedge shaped compound bones of the skull: see SKULL: Also sphenoidal n. 1. the sphenoid bone …   English World dictionary

  • Sphenoīd — Sphenoīd, vierflächige Kristallgestalt, Hemiëder der quadratischen oder rhombischen Pyramide; vgl. Kristall, S. 705 …   Meyers Großes Konversations-Lexikon

  • Sphenoid — Sphenoīd, hemiëdrische Form des tetragonalen und rhombischen Kristallsystems …   Kleines Konversations-Lexikon

  • sphenoid — adj. & n. adj. 1 wedge shaped. 2 of or relating to the sphenoid bone. n. (in full sphenoid bone) a large compound bone forming the base of the cranium behind the eyes. Derivatives: sphenoidal adj. Etymology: mod.L sphenoides f. Gk sphenoeides f.… …   Useful english dictionary

  • sphenoid — I. adjective or sphenoidal Etymology: New Latin sphenoides, from Greek sphēnoeidēs wedge shaped, from sphēn wedge Date: 1732 1. of, relating to, or being a winged compound bone of the base of the cranium 2. (usually sphenoidal) having a wedged… …   New Collegiate Dictionary

  • Sphenoid — Als Sphenoid (zu altgriech. σφήν „Keil“) bezeichnet man: in der Medizin umgangssprachlich das Keilbein (Os sphenoidale) in der Kristallographie eine keilähnliche Form aus zwei Flächen, siehe Dieder in der Geometrie (ungenau) ein Disphenoid …   Deutsch Wikipedia

  • sphenoid — /sfee noyd/, adj. Also, sphenoidal. 1. wedge shaped. 2. Anat. of or pertaining to the compound bone of the base of the skull, at the roof of the pharynx. See diag. under skull. n. 3. Anat. the sphenoid bone. [1725 35; < NL sphenoides < Gk… …   Universalium

  • sphenoid — 1. adjective Wedge shaped. 2. noun The sphenoid bone …   Wiktionary

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