parasitising

/ˈpɛrəsaɪtaɪzɪŋ/
adjective
  1. Acting as a parasite; living off another organism or person in a harmful way.
    • Parasitising insects often lay their eggs inside the bodies of other insects.
    • The parasitising fungus slowly drained the tree of its nutrients.
    • The parasitising behavior of the cuckoo is well known to birdwatchers.
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