from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A bone situated immediately beneath the sphenoid in the base of the skull in many vertebrates.
from the GNU version of the Collaborative International Dictionary of English
- adj. Near the sphenoid bone; -- applied especially to a bone situated immediately beneath the sphenoid in the base of the skull in many animals.
from The Century Dictionary and Cyclopedia
- n. A long azygous dagger-shaped membrane-bone extending in midline lengthwise beneath the base of the skull in Sauropsida, along the course of the sphenoid bone proper. It forms part of the so-called rostrum or beak of the skull.
- n. A median unpaired bone underlying the skull of amphibians and fishes, articulating with the vomer in front and with several bones behind.
- n. This does not appear to be the same bone as that of the same name in the higher vertebrates, and has been ho-mologized by some authors with the true vomer of the latter. See def. 1, and cuts under Lepidosiren and Anura.
- Lying under or alongside the sphenoid; of or pertaining to the parasphenoid, in either sense; parasphonoidal.
para- + sphenoid (Wiktionary)