noun, plural fornices [fawr-nuh-seez] . Anatomy.
any of various arched or vaulted structures, as an arching fibrous formation in the brain.

1675–85; < Latin: vault, arch

fornical, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
fornix (ˈfɔːnɪks)
n , pl -nices
anatomy any archlike structure, esp the arched band of white fibres at the base of the brain
[C17: from Latin; see fornicate²]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1680s, from L. fornix arch, vaulted chamber (see fornication).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

fornix for·nix (fôr'nĭks)
n. pl. for·ni·ces (-nĭ-sēz')

  1. An arch-shaped structure, especially the arch-shaped roof of an anatomical space.

  2. The compact bundle of white fiber by which the hippocampus of each cerebral hemisphere projects to the opposite hippocampus and to the septum, the anterior nucleus of the thalamus, and the mamillary body.

The American Heritage® Stedman's Medical Dictionary
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