noun, plural bar·bas·cos.
a shrub or small tree, Jacquinia barbasco, of tropical America, the source of a substance used to stun fish so they can be caught easily.
any similar plant yielding a substance that stuns or kills fish.
the fish-stunning or fish-killing substance obtained from these plants.
Origin of barbasco
1855–60; < American Spanish, said to be alteration of verbasco mullein < Latin verbascum
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019