The Collaborative International Dictionary of English v.0.48:

bacca \bac"ca\ n.
   1. an indehiscent fruit derived from a single ovary having
      one or many seeds within a fleshy wall or pericarp: e. g.
      grape; tomato; cranberry.

   Syn: simple fruit
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

bacca
    n 1: an indehiscent fruit derived from a single ovary having one
         or many seeds within a fleshy wall or pericarp: e.g. grape;
         tomato; cranberry [syn: simple fruit, bacca]