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[foh-lee-uh m] /ˈfoʊ li əm/
noun, plural folia
[foh-lee-uh] /ˈfoʊ li ə/ (Show IPA)
a thin leaflike stratum or layer; a lamella.
Geometry. a loop; part of a curve terminated at both ends by the same node. Equation: x 3 + y 3 = 3 axy.
Origin of folium
1840-50; < New Latin, Latin: literally, a leaf Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for folium


noun (pl) -lia (-lɪə)
a plane geometrical curve consisting of a loop whose two ends, intersecting at a node, are asymptotic to the same line. Standard equation: x³ + y³=3axy where x=y+a is the equation of the line
any thin leaflike layer, esp of some metamorphic rocks
Word Origin
C19: from Latin, literally: leaf
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
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Word Origin and History for folium

see folio.

Online Etymology Dictionary, © 2010 Douglas Harper
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folium in Medicine

folium fo·li·um (fō'lē-əm)
n. pl. fo·li·a (-lē-ə)
A broad, thin, leaflike structure, as of the cerebellar cortex.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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folium in Science
Plural folia
  1. A thin, leaflike layer or stratum occurring especially in metamorphic rock.

  2. A plane cubic curve having a single loop, a node, and two ends asymptotic to the same line. Also called folium of Descartes.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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