veratridine

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A yellowish-white, amorphous powdered alkaloid, C₃₆H₅₁NO₁₁, obtained from sabadilla seeds and from the rhizomes of some hellebores of the genus Veratrum.

from The Century Dictionary.

• noun An alkaloid, isomeric with veratrine and occurring along with it in the so-called veratrine of ordinary medical use, differing however from it in being amorphous instead of crystallizable and being much more soluble in water.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun organic chemistry Any of a family of neurotoxic steroid-derived alkaloids, occurring in the seeds of the sabadilla plant