1) Alkaloid 2) Curare 3) Neuromuscular blocking agent 4) Phytotoxin 5) Plant toxin 1) Curare 
(from the article `drug`) ...amplitude of the end-plate potential falls below a critical level, it fails to initiate an impulse in the muscle fibre, and transmission is ... ...is a powerful antimalarial agent that was formerly the drug of choice for treating that disease, though it has been largely replaced by less toxic ... Several ...
<drug> An alkaloid that acts as a muscle relaxant by blocking acetyl choline receptors. ... (18 Nov 1997) ... 
(too″bo-ku-rah´rēn) an alkaloid from the bark and stems of Chondrodendron tomentosum; it is the active principle of curare and is a nondepolarizing neuromuscular blocking agent; used in the form of the chloride salt for relaxation of skeletal muscles in surgery and convulsive therapy and as an aid in the diagnosis ...
An alkaloid that acts as a muscle relaxant by blocking acetylcholine (ACh) receptors.
[n] - a toxic alkaloid found in certain tropical South American trees that is a powerful relaxant for striated muscles
curare noun a toxic alkaloid found in certain tropical South American trees that is a powerful relaxant for striated muscles; `curare acts by blocking cholinergic transmission at the myoneural junction`
the principal active alkaloid of curare, CHClNO, used as a muscle relaxant, esp. as an adjunct to anesthesia.