[falks, fawlks]
noun, plural fal·ces [fal-seez, fawl-] /ˈfæl siz, ˈfɔl-/. Anatomy.
  1. a structure shaped like a sickle, as a fold of dura mater separating the cerebral hemispheres.

Origin of falx

1700–10; < New Latin, Latin: sickle
Related formsfal·cial [fal-shuh l, fawl-] /ˈfæl ʃəl, ˈfɔl-/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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[fălks, fôlks]
n. pl. fal•ces (fălsēz′, fôl-)
  1. A sickle-shaped anatomical structure.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.