The Collaborative International Dictionary of English v.0.48:

Falcate \Fal"cate\, Falcated \Fal"ca*ted\, a. [L. falcatus, fr.
   falx, falcis, a sickle or scythe.]
   Hooked or bent like a sickle; as, a falcate leaf; a falcate
   claw; -- said also of the moon, or a planet, when horned or
   crescent-formed.
   [1913 Webster]

WordNet (r) 3.0 (2006):

falcate
    adj 1: curved like a sickle; "a falcate leaf"; "falcate claws";
           "the falcate moon" [syn: falcate, falciform, sickle-
           shaped]

Moby Thesaurus II by Grady Ward, 1.0:

26 Moby Thesaurus words for "falcate":
   Cynthian, S-shaped, bicorn, corniform, crescent, crescent-shaped,
   crescentic, crescentiform, crescentlike, falciform, horn-shaped,
   horned, lunar, lunate, luniform, lunular, menisciform, meniscoid,
   moon-shaped, moonlike, semicircular, semilunar, sickle-like,
   sickle-shaped, sigmoid, two-horned