The Collaborative International Dictionary of English v.0.48:

Hastate \Has"tate\ (h[a^]s"t[asl]t), Hastated \Has"ta*ted\
   (h[=a]s"t[asl]*t[e^]d), a. [L. hastatus, fr. hasta spear. Cf.
   Gad, n.]
   Shaped like the head of a halberd; triangular, with the basal
   angles or lobes spreading; as, a hastate leaf.
   [1913 Webster]