Definitions

1. noun

A plant that contains or emits a toxic substance, especially one that can cause skin irritation or blistering.

“The hikers warned each other about the poisonweed that grew in the area.”

2. noun

A type of plant with toxic seeds, especially one that causes blistering or inflammation in contact with the skin.

“The poisonweed is a common allergen found in many parts of the world.”