pl. -·li·ums or -·lia
- Geol. a thin layer of stratum, as in metamorphic rock
- Geom. the looping, closed part of a curve extending from a node
Origin of foliumL: see foliate
- Geology A thin, leaflike layer or stratum occurring especially in metamorphic rock.
- Mathematics A plane cubic curve having a single loop, a node, and two ends asymptotic to the same line.
Origin of foliumLatin, leaf; see bhel-3 in Indo-European roots.
The equation of the folium of Descartes is x3 + y3 = 3axy.
(plural foliums or folia)
Latin, a leaf.