folium Meaning, Definition & Usage

  1. noun a thin layer or stratum of (especially metamorphic) rock

WordNet

Fo"li*um noun
Etymology
L., a leaf.
Wordforms
plural E Foliums L Folia
Definitions
  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.

Webster 1913