The Collaborative International Dictionary of English v.0.48:

Areolate \A*re"o*late\, Areolated \A*re"o*la*ted\, a. [L.
   areola: cf. F. ar['e]ole.]
   Divided into small spaces or areolations, as the wings of
   insects, the leaves of plants, or the receptacle of compound
   flowers.
   [1913 Webster]