/ˈfôrniks/
Noun, pl. fornices
(Anatomy)
1. An archlike structure or fold. (wiktionary.org)
2. Specifically, the arched bundle of fibres or axons at the base of the brain. (wiktionary.org)
3. An arch or fold; as, the fornix, or vault, of the cranium; the fornix, or reflection, of the conjuctiva; esp, two longitudinal bands of white nervous tissue beneath the lateral ventricles of the brain. (biology-online.org)
4. A vaulted or arched structure in the body, in particular. (Google Dictionary)
5. A triangular area of white matter in the mammalian brain between the hippocampus and the hypothalamus. (Google Dictionary)
6. Generally, any arch shaped structure (but often it refers to the arched roof of an anatomical space). (wordnetweb.princeton.edu)
Word origin: From Latin fornix “arch, vaulted chamber”