The Collaborative International Dictionary of English v.0.48:

Ecballium \Ec*bal"li*um\, n. [NL., fr. Gr. ?. See Ecbole.]
   (Bot.)
   A genus of cucurbitaceous plants consisting of the single
   species Ecballium agreste (or Elaterium), the squirting
   cucumber. Its fruit, when ripe, bursts and violently ejects
   its seeds, together with a mucilaginous juice, from which
   elaterium, a powerful cathartic medicine, is prepared.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Ecballium
    n 1: exploding cucumber; squirting cucumber [syn: Ecballium,
         genus Ecballium]