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
Word origin
C19: from Latin, literally: leaf
folium in American English
(ˈfoʊliəm)
nounWord forms: pluralˈfoliums or ˈfolia (ˈfoʊliə)
1. Geology
a thin layer of stratum, as in metamorphic rock
2. Geometry
the looping, closed part of a curve extending from a node