Folium

Folium (, "leaf"), plural folia, may refer to

* a leaf of a book: see recto and verso
* Folium of Descartes, an algebraic curve
* Folium (spider), a marking on the abdomen of a spider

Brain anatomy

* Folium (brain)
* Folium vermis

Botany

* Turnsole or folium, a dyestuff
* Folium Phyllostachydis, processed leaves of bamboo
* Hydrangeae Dulcis Folium, processed leaves of hydrangea

{{disambig