orbitosphenoidn.adj.
/ˌɔːbɪtə(ʊ)ˈsfiːnɔɪd/, U.S. /ˈˌɔrbədoʊˈsfiˌnɔɪd/ Zoology and Anatomy.
A. n.
The orbital part of the sphenoid bone (the lesser wing of the sphenoid in the human skull); (also) a bone in the skull of various other vertebrates that corresponds to this.
ΘΚΠ
the world > life > the body > structural parts > bone or bones > skull > parts of skull > [noun] > socket of eye > parts of or associated with
eyebrow1583
meditullium1683
superciliary ridge1726
superciliary arch1733
supraorbital1797
lacrimal1822
suborbital1824
suborbitary1825
suborbitar1828
superciliary1831
eyebrow ridge1837
eye cap1837
orbitosphenoid1847
prefrontal1851
superorbital1854
jugum sphenoidale1887
ungual bone1888
1847 R. Owen in Rep. Brit. Assoc. 1846 173 In substituting names for phrases, I have endeavoured..to approximate the sound of the name as nearly as possible to those of the leading terms of the definition or phrase, as e.g...orbitosphenoid for ‘ala superior seu orbitalis, &c. sphenoidalis,’ and for ‘aile orbitaire du sphénoïde’.
1873 St. G. Mivart Lessons Elem. Anat. iii. 110 Each of the lesser wings of the sphenoid is termed in Zootomy an orbito-sphenoid.
1880 A. Günther Introd. Study of Fishes 86 Prosencephalic arch, composed of pre-sphenoid, orbito-sphenoid, frontal and postfrontal.
1931 E. G. Boulenger Fishes xv. 118 A small bone, forming part of the eye socket, the orbitosphenoid, and which is wanting in the true Perches, is present.
1983 New Scientist 28 Apr. 221/1 In surface-living lizards..the orbitosphenoid is a mere wisp of flimsy, soft cartilage.
2000 Ann. Anat. 182 537 The skull bones, with the exception of the orbitosphenoid, develop and ossify sequentially from caudal to rostral in these directly developing species.
B. adj.
Of or relating to the orbit and the sphenoid bone; spec. designating the part of the sphenoid bone that forms part of the wall of the orbit, or a small separate bone corresponding to this.
ΘΚΠ
the world > life > the body > structural parts > bone or bones > skull > parts of skull > [adjective] > socket of eye
orbital?1541
orbitary1703
superciliary1704
orbitar1726
suborbitary1733
infra-orbitar1741
supraorbital1767
supraorbitar1775
supra-orbitary1794
suborbitar1797
suborbital1803
infra-orbital1806
infra-orbitary1822
lachrymonasal1837
interorbital1852
preorbital1852
transorbital1852
orbitosphenoid1854
exorbital1876
periorbital1890
1854 R. Owen Struct. Skeleton & Teeth in Orr's Circle Sci.: Org. Nature I. 193 The smooth orbitosphenoid plate of the frontal joins the outer margin.
1895 Amer. Naturalist 29 857 As the..orbitosphenoid bones are rudimental or wanting, the brain case is without osseous wall in front.
1948 Philos. Trans. (Royal Soc.) B. 233 296 The bone surface is slightly wrinkled in the..orbitosphenoid regions.
1995 Amer. Jrnl. Physical Anthropol. 97 435 Among primates, squirrel monkeys uniquely possess an interorbital fenestra, in which the midline bony orbitosphenoid septum is largely absent and the soft tissues of the orbits are separated only by a thin membrane.
Derivatives
ˌorbitospheˈnoidal adj. = sense B.
ΚΠ
1865 Philos. Trans. (Royal Soc.) 155 44 Most of the..orbitosphenoidal regions of the lateral walls.
1873 St. G. Mivart Lessons Elem. Anat. iii. 83 A pair of lesser-wings, or orbito-sphenoidal parts.
1944 Amer. Midland Naturalist 31 439 The skull..was not dissected for the examination of the presphenoidal and orbitosphenoidal regions.
1999 Jrnl. Neurosurg. 91 1034 (title) Intraosseous orbitosphenoidal cavernous angioma.
This entry has been updated (OED Third Edition, September 2004; most recently modified version published online March 2022).
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n.adj.1847