Any of various roots poisonous to humans or animals, specifically the red horse chestnut, Aesculus pavia, the root and twigs of which were formerly used to stupefy fish.
Origin
Early 18th century; earliest use found in James Petiver (c1665–1718), botanist and entomologist.
Definition of poison root in US English:
poison root
noun
Any of various roots poisonous to humans or animals, specifically the red horse chestnut, Aesculus pavia, the root and twigs of which were formerly used to stupefy fish.
Origin
Early 18th century; earliest use found in James Petiver (c1665–1718), botanist and entomologist.