[L. folium leaf.]
1. = FOLIO 6.
1886. Statem. Land Laws Incorp. Law Soc., 26. Certificates of title, each constituting a distinct folium consisting of two or more pages.
2. Geom. a. A finite loop of a nodal curve terminated at both ends by the same node. b. Folium of Descartes, a plane nodal cubic curve with real nodal tangents, and one real inflection at infinity.
1848. B. Price, Diff. Calculus (1852), I. 319. To determine the nature of the point at the origin of the Folium of Descartes.
c. Used with prefixes uni-, bi-, etc. to indicate a curve with one, two, etc., indentations.
1873. Salmon, Higher Plane Curves, vi. (1879), 221. Zeuthen confines the name oval to a branch, having no real bitangent or inflexions: one with a single real bitangent he calls a unifolium; one with 2, 3, or 4 such bitangents, a bifolium, trifolium or quadrifolium.
