Etymology
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parasitic (adj.)

"of pertaining to, or characteristic of a parasite," in any sense, 1620s, from Latin parasiticus, from Greek parasitikos "of or pertaining to a parasite; the trade of a parasite," from parasitos "one who lives at another's expense" (see parasite). Biological sense is from 1731. Related: Parasitical, 1570s in reference to toadies; from 1640s in the biological sense.

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Definitions of parasitic

parasitic (adj.)
relating to or caused by parasites;
parasitic infection
Synonyms: parasitical
parasitic (adj.)
of or pertaining to epenthesis;
Synonyms: epenthetic
parasitic (adj.)
of plants or persons; having the nature or habits of a parasite or leech; living off another;
a wealthy class parasitic upon the labor of the masses
parasitic vines that strangle the trees
Synonyms: parasitical / leechlike / bloodsucking
From wordnet.princeton.edu