noun Botany.

  1. an often large, finely divided leaf, especially as applied to the ferns and certain palms.
  2. a leaflike expansion not differentiated into stem and foliage, as in lichens.


  1. a large compound leaf, esp of a fern
  2. the thallus of a seaweed or a lichen

1785, from Latin frons (genitive frondis) “leafy branch, green bough, foliage.” Adopted by Linnæus in a sense distinct from folium.

  1. A leaf of a fern or cycad, usually consisting of multiple leaflets.
  2. A large, fanlike leaf of a palm tree.
  3. A leaflike structure such as the thallus of a lichen or a seaweed.
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