Origin: Germanic Old English prefix
Fornix has 4 different meanings across 1 category:
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 the thalamus and mamillary bodies
An archlike or vaulted structure or fold:
The junction where the conjunctiva lining the eyelid meets the conjunctiva overlying the sclera.