parasite

noun
par*a*site \ ˈper-ə-ˌsīt \ ˈpa-rə- \
1539{ds||2||}
  • an organism living in, on, or with another organism in order to obtain nutrients, grow, or multiply often in a state that directly or indirectly harms the host
  • someone or something that resembles a biological parasite in living off of, being dependent on, or exploiting another while giving little or nothing in return
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