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2 definitions found
 for folium
From The Collaborative International Dictionary of English v.0.48 :

  Folium \Fo"li*um\, n.; pl. E. Foliums, L. Folia. [L., a
     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

From WordNet (r) 3.0 (2006) :

      n 1: a thin layer or stratum of (especially metamorphic) rock

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