
 Elaterium or elaterin is the name of a plant extract that is used as a purgative. It is extracted from the juice of the fruit of Ecballium Elaterium, the squirting cucumber, which is native to the Mediterranean region. ==The plant: Ecballium elaterium== The squirting cucmber, a member of the natural order Cucurbitaceae, resembles the vegetable mar...
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http://en.wikipedia.org/wiki/Elaterium

• (n.) A cathartic substance obtained, in the form of yellowish or greenish cakes, as the dried residue of the juice of the wild or squirting cucumber (Ecballium agreste, formerly called Momordica Elaterium).
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http://thinkexist.com/dictionary/meaning/elaterium/

El`a·te'ri·um  noun [ Latin , from Greek ..., neut. of ... driving. See 2d  Elater .] A cathartic substance obtained, in the form of yellowish or greenish cakes, as the dried residue of the juice of the wild or squirting cucumber ( Ecballium agreste , formerly called  Momordica Elaterium
Found on 
http://www.encyclo.co.uk/webster/E/16

Elaterium is a very powerful hydragogue purhative. It is a green deposit formed by expressing and drying the juice of the unripe squirting cucumber.
Found on 
http://www.probertencyclopaedia.com/browse/EE.HTM
  No exact match found.