fornix

 
Pronunciation: /ˈfɔːnɪks/

noun (plural fornices /ˈfɔːnɪsiːz/)

Anatomy
  • a vaulted or arched structure in the body, in particular:
  • (also fornix cerebri /ˈsɛrɪbrʌɪ/) a triangular area of white matter in the mammalian brain between the hippocampus and the hypothalamus.

Origin:

late 17th century: from Latin, literally 'arch, vaulted chamber'