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The Collaborative International Dictionary of English v.0.48:

Folium \Fo"li*um\, n.; pl. E. Foliums, L. Folia. [L., a leaf.] 1. A leaf, esp. a thin leaf or plate. [1913 Webster] 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. [1913 Webster] Folk