n. 1 an organism living in or on another and benefiting at the expense of the other. 2 a person who lives off or exploits another or others. 3 Philol. an inorganic sound or letter developing from an adjacent one. parasitic adj. parasitical adj. parasitically adv. parasiticide n. parasitism n. parasitology n. parasitologist n.
[ L parasitus f. Gk parasitos one who eats at another's table (as PARA-(1), sitos food) ]