Folium

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