triffaids

(n) : A fictional plant, able to move around and kill people with a poisonous stinger

(n) : (colloquial) Any of the sea anemones of the genus Aiptasia with poisonous tentacles, which are a pest in aquaria.

(n) : Any large, fast-growing and hard-to-remove weed, such as the flowering shrub Chromolaena odorata.