IPA: //ˈkaʊ.beɪn//
KK: /ˈkaʊˌbeɪn/
A type of plant that is often found in North America, known for its white flowers and toxic properties. It belongs to the carrot family and can be dangerous if ingested.
The cowbane plant is known for its beautiful flowers, but it is also very poisonous.
Cowbane is formed from "cow" (from Old English "cu", meaning the domesticated animal) and "bane" (from Old English "bana", meaning killer or destroyer). The word refers to a plant that is deadly to cows, hence a killer of cows.
Think of a 'cow' being harmed by a 'killer' ('bane') — that's why cowbane refers to a plant that can be deadly to cows.