I. noun
a person who is supported or seeks support from another without making an adequate return
lived as a parasite in his father's house
Synonyms: barnacle, bloodsucker, freeloader, hanger-on, leech, lounge lizard, ||spiv, sponge, sponger, sucker; compare sycophant
Related Word: dependent; smell-feast; deadbeat, idler, laze
II. verb
Synonyms: infest 2, parasitize