An arched bundle of white fibers at the base of the brain by which the hippocampus of each hemisphere projects to the contralateral hippocampus and to the thalamus and mamillary bodies

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Fornix \For"nix\, n.; pl. Fornices . [L., an arch.] (Anat.) 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 ...

WordNet Word definitions in WordNet
n. generally any arch shaped structure (but often it refers to the arched roof of an anatomical space) an arched bundle of white fibers at the base of the brain by which the hippocampus of each hemisphere projects to the contralateral hippocampus and to ...

Wiktionary Word definitions in Wiktionary
n. 1 (context anatomy English) An archlike structure or fold. 2 (context anatomy English) Specifically, the arched bundle of fibres or axons at the base of the brain.

Wikipedia Word definitions in Wikipedia
Fornix (plural fornices , Latin for " arch ") can refer to: Fornix or throat scale , a bowed prolongation of the corolla in Boraginaceae ( cf. ) Fornix of the brain Fornix conjunctiva, a part of the Conjunctiva Fornix vaginae, also called the vaginal fornix ...

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
from 1680s in reference to various arched formations (especially in anatomy), from Latin fornix "arch, vaulted chamber, cellar, vaulted opening" (see fornication ).