sphenoid

IPA: sfʌnɔɪd

(anatomy) The sphenoid bone.
(crystallography) A wedge-shaped crystal bounded by four equal isosceles triangles; the hemihedral form of a square pyramid.

Having a wedged 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.

Examples of "sphenoid" in Sentences

The third through the left sphenoid bone, the fourth through the left temporal bone.
Through the newly drilled hole in the sphenoid bone, Yarborough introduced the needle tip.
One was a LOMFDGB little old man fall down and go boom with a nasty 4cm nonlinear laceration on his sphenoid.
The bullet had entered through the left temple, burning and splitting the skin and singeing Grace's hair above the wound, and shattering the sphenoid bone.
The orbital plate and that part of the sphenoid which is found in the temporal fossa, as well as the lateral pterygoid plate, are ossified in membrane (Fawcett) 34.
Since 1998, every MRI I've had for a brain tumor has also shown an abnormal sphenoid sinus fluid level which accounts neatly for my thrice yearly sinus/cold/bronchitis problems.
You know that there is a disease called giantism, caused by ‘a certain morbid process in the sphenoid bone of the skull — viz., an excessive development of the anterior lobe of the pituitary body’ (this is from the nearest encyclopedia).
Some student in the rhinology department had taken out the turbinates in his nose—and the whole rhinology department, judging from the notes, had taken turns finding and irrigating his sphenoid sinuses—the most difficult sinuses in the human head to reach.