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

Moby Thesaurus II by Grady Ward, 1.0:

55 Moby Thesaurus words for "frond":
   bine, blade, bough, bract, bracteole, bractlet, branch,
   branchedness, branchiness, burgeon, cotyledon, deadwood, flag,
   flagellum, floral leaf, foliole, fork, glume, involucre,
   involucrum, lamina, leaf, leaflet, lemma, ligule, limb, needle,
   offshoot, petal, pile, pine needle, ramage, ramification, runner,
   sarment, scion, seed leaf, sepal, shoot, slip, spathe, spear,
   spire, spray, sprig, sprit, sprout, stipula, stipule, stolon,
   sucker, switch, tendril, thallus, twig