/ˈgɑːlwɪd/ GAH-lwid

Definitions

1. noun

a weed, especially a thistle or similar plant, that produces a gall or other abnormal growth on a nearby plant, often as a result of being used as a food plant by an insect, such as a gall wasp.

“The gardener tried to eradicate the gallweed that was infesting her prize-winning roses.”