zygantrum

from The Century Dictionary.

• noun In herpetology, the fossa upon the posterior face of the neural arch of a vertebra of serpents and some lizards, for the reception of the zygosphene of a succeeding vertebra, the series of vertebræ being more effectively interlocked thereby than is accomplished by the zygapophyses alone. Compare cut under zygosphene.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Anat.) See under zygosphene.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun anatomy See under zygosphene.