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 ...

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.

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 ).

Wikipedia Word definitions in Wikipedia
The fornix is a C-shaped bundle of nerve fibers in the brain that carries signals from the hippocampus to the mammillary bodies and then to the anterior nuclei of thalamus . The fornix is part of the limbic system . While its exact function and importance ...

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 ...