The Collaborative International Dictionary of English v.0.48:

Limbate \Lim"bate\ (l[i^]m"b[asl]t), a. [L. limbatus, fr. limbus
   border, edge. See Limbus.] (Bot. & Zool.)
   Bordered, as when one color is surrounded by an edging of
   another.
   [1913 Webster]