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folium

[foh-lee-uhm]

noun, plural fo·li·a

[-lee-uh] .

a thin leaflike stratum or layer; a lamella.

Geometry. a loop; part of a curve terminated at both ends by the same node. Equation: x³ + y³ = 3axy.

Origin:
1840–50; < Neo-Latin, Latin: literally, a leaf

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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Folium is always a great word to know.

So is gobo. Does it mean:

a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.

an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.

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Collins

World English Dictionary

folium (ˈfəʊlɪəm)

—n , pl -lia
1.	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
2.	any thin leaflike layer, esp of some metamorphic rocks

[C19: from Latin, literally: leaf]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage

Medical Dictionary

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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American Heritage

Science Dictionary

folium (fō'lē-əm) Pronunciation Key
Plural folia

A thin, leaflike layer or stratum occurring especially in metamorphic rock.
A plane cubic curve having a single loop, a node, and two ends asymptotic to the same line. Also called folium of Descartes.

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