triffid

noun3

1. •
   A fictional plant, able to move around and kill people with a poisonous stinger

   • But this should not lead to complete avoidance, as if it is like some dire incursion of triffids or ents. — 2003
2. •
   Any large, fast-growing and hard-to-remove weed, such as the flowering shrub Chromolaena odorata.

   • But some of them are multiplying fast, and those dismissed as trivial today, because they only infest a few road verges, may well turn into triffids tomorrow. — 1999
3. •
   (informal) Any of the sea anemones of the genus Aiptasia with poisonous tentacles, which are a pest in aquaria.

   • The plant is also very rare (related to triffids ... be wary) as it acts like a venus fly trap except it gives its catches to the fish, a truly symbiotic relationship — 2000