The Collaborative International Dictionary of English v.0.48:

Frond \Frond\ (fr[o^]nd), n. [L. frons, frondis, a leafy branch,
   foliage.] (Bot.)
   The organ formed by the combination or union into one body of
   stem and leaf, and often bearing the fructification; as, the
   frond of a fern or of a lichen or seaweed; also, the peculiar
   leaf of a palm tree.
   [1913 Webster]

WordNet (r) 3.0 (2006):

frond
    n 1: compound leaf of a fern or palm or cycad