folium

1. (countable, rare, uncountable) A leaf.
2. (countable, uncountable) A leaf (2 pages) of a codex or manuscript.
3. (countable, uncountable) A document that acts as the legal record of a transaction.
4. (countable, especially, uncountable) A document that acts as the legal record of a transaction.
5. (countable, uncountable) A thin sheet or plate of a foliated rock or mineral.
6. (countable, uncountable) A lobe on a branching structure.
7. (countable, uncountable) A lobe on a branching structure.
8. (countable, uncountable) 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. (uncountable) Synonym of turnsole (“purple dye”).
10. (countable, uncountable) A symmetric pattern on the abdomen of some spiders.

Etymology

From Latin folium (“leaf”). Doublet of foil and folio, distantly also with phyllo and phyllon.

Synonyms

blade

fin

lamina

leaf

lobe

paddle

vane

leaf blade