ba·tra·cho·tox·in 
(bə-trăk′ə-tŏksĭn, băt′rə-kō-)
(bə-trăk′ə-tŏksĭn, băt′rə-kō-)n.
A steroid alkaloid derived from skin secretions of South American poison-dart frogs of the genus Phyllobates. It is one of the most potent venoms known.
[Greek batrakhos, frog + TOXIN.]