fornix
/ˈfɔːnɪks/noun
(pl. fornices /-nɪsiːz/)
1- Anatomy a vaulted or arched structure in the body, in particular【剖】穹隆, 穹, 尤指：
1.1
- （亦作fornix cerebri /ˈserɪbraɪ/）a triangular area of white matter in the mammalian brain between the hippocampus and the hypothalamus大脑穹隆。
词源
late 17th cent.: from Latin, literally 'arch, vaulted chamber'.