The Collaborative International Dictionary of English v.0.48:

Erose \E*rose"\, a. [L. erosus, p. p. See Erode.]
   1. Irregular or uneven as if eaten or worn away.
      [1913 Webster]

   2. (Bot.) Jagged or irregularly toothed, as if nibbled out or
      gnawed. -- E*rose"ly, adv.
      [1913 Webster]