Source : Webster's Revised Unabridged Dictionary (1913)

Mytilotoxine \Myt`i*lo*tox"ine\, n. [Mytilus + toxic.] (Physiol.
   Chem.)
   A poisonous base (leucomaine) found in the common mussel. It
   either causes paralysis of the muscles, or gives rise to
   convulsions, including death by an accumulation of carbonic
   acid in the blood.