Caper

n.
  1. The pungent grayish green flower bud of the European and Oriental caper (Capparis spinosa), much used for pickles.
  2. (Bot.) A plant of the genus Capparis; -- called also caper bush, caper tree.
    3. Bean caper .
    See Bran caper, in the Vocabulary.
    Caper sauce ,
    a kind of sauce or catchup made of capers.