Word:

# Folium

Fo´li`um
 n. 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 x3 + y3 = axy.
 Noun 1 folium - a thin layer or stratum of (especially metamorphic) rock
formation, geological formation
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