parasite

loinen

parasiitti puhekieltä A person who lives on other people's efforts or expense and gives little or nothing back. (defdate)
puhekieltä An organism that lives on or in another organism, deriving benefit from living on or in that other organism, while not contributing towards that other organism sufficiently to cover the cost to that other organism.
{{quote-magazine|date=2013-03

''Lice, fleas, ticks and mites are widely spread parasites.

Her golden tresses shade / The bosom’s stainless pride, / Curling like tendrils of the parasite / Around a marble column.