The Collaborative International Dictionary of English v.0.48:

Lobate \Lo"bate\, Lobated \Lo"ba*ted\, a. [See Lobe.]
   1. (Bot.) Consisting of, or having, lobes; lobed; as, a
      lobate leaf.
      [1913 Webster]

   2. (Zool.)
      (a) Having lobes; -- said of the tails of certain fishes
          having the integument continued to the bases of the
          fin rays.
      (b) Furnished with membranous flaps, as the toes of a
          coot. See Illust. (m) under Aves.
          [1913 Webster]

WordNet (r) 3.0 (2006):

lobate
    adj 1: having or resembling a lobe or lobes; "a lobate tongue"
           [syn: lobate, lobated]
    2: having deeply indented margins but with lobes not entirely
       separate from each other [syn: lobed, lobate]