1. fornix, body part

usage: generally any arch shaped structure (but often it refers to the arched roof of an anatomical space)

2. fornix, trigonum cerebrale, fiber bundle, fibre bundle, fascicle, fasciculus

usage: 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

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See also: fornix (Dictionary)