From The Collaborative International Dictionary of English v.0.44 [gcide]:
Folium \Fo"li*um\, noun; pl. E. {Foliums}, L. {Folia}. [L., a leaf.]
1. A leaf, esp. a thin leaf or plate.
2. (Geom.) A curve of the third order, consisting of two infinite branches, which have a common asymptote. The curve has a double point, and a leaf-shaped loop; whence the name. Its equation is x^{3} + y^{3} = axy.
From WordNet (r) 2.0 [wn]:
noun
1: a thin layer or stratum of (especially metamorphic) rock [also: {folia} (pl)]
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