The Collaborative International Dictionary of English v.0.48:

Aciniform \A*cin"i*form\, a. [L. acinus a grape, grapestone +
   -form: cf. F. acinoforme.]
   1. Having the form of a cluster of grapes; clustered like
      grapes.
      [1913 Webster]

   2. Full of small kernels like a grape.
      [1913 Webster] Acinose