Is it ensure, insure, or assure?
1785, from Latin frons (genitive frondis) "leafy branch, green bough, foliage." Adopted by Linnæus in a sense distinct from folium.
A leaf of a fern or cycad, usually consisting of multiple leaflets.
A large, fanlike leaf of a palm tree.
A leaflike structure such as the thallus of a lichen or a seaweed.