folium

Short definition from Wiktionary

Noun

1. 1
   A leaf.
2. 2
   A leaf (2 pages) of a codex or manuscript.
3. 3
   A document that acts as the legal record of a transaction.
4. 4
   A document that acts as the legal record of a transaction: A certificate of title.
5. 5
   A thin sheet or plate of a foliated rock or mineral.
6. 6
   A lobe on a branching structure.
7. 7
   A lobe on a branching structure: A leaf-like protrusion or lobule on one of the vermes of the cerebellum.
8. 8
   A curve of the third order, consisting of two infinite branches having a common asymptote. The curve has a double point, and a leaf-shaped loop.
9. 9
   Synonym of turnsole (“purple dye”).
10. 10
    A symmetric pattern on the abdomen of some spiders.