The Collaborative International Dictionary of English v.0.48:

Scillitin \Scil"li*tin\, n. [Cf. F. scilitine.] (Chem.)
   A bitter principle extracted from the bulbs of the squill
   (Scilla maritima), and probably consisting of a complex
   mixture of several substances.
   [1913 Webster + PJC] Scimiter