fornix

[fawr-niks]
noun, plural for·ni·ces [fawr-nuh-seez] /ˈfɔr nəˌsiz/. Anatomy.
  1. any of various arched or vaulted structures, as an arching fibrous formation in the brain.

Origin of fornix

1675–85; < Latin: vault, arch
Related formsfor·ni·cal, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for fornix

fornix

noun plural -nices (-nɪˌsiːz)
  1. anatomy any archlike structure, esp the arched band of white fibres at the base of the brain
Derived Formsfornical, adjective

Word Origin for fornix

C17: from Latin; see fornicate ²
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for fornix
n.

1680s, from Latin fornix "arch, vaulted chamber" (see fornication).

Online Etymology Dictionary, © 2010 Douglas Harper

fornix in Medicine

fornix

[fôrnĭks]
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 Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.