Tick, e.g. (8)
I believe the answer is:
parasite
(Other definitions for parasite that I've seen before include "sponge" , "Organism growing on or in another" , "Sponger" , "Creature that lives off others" , "Possibly tick" .)
I believe the answer is:
parasite
(Other definitions for parasite that I've seen before include "sponge" , "Organism growing on or in another" , "Sponger" , "Creature that lives off others" , "Possibly tick" .)