Folium

Folium (Latin: folium, "leaf") may refer to

a leaf of a book: see recto and verso
Folium of Descartes, an algebraic curve

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

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