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parasitize

American  
[par-uh-si-tahyz, -sahy-] / ˈpær ə sɪˌtaɪz, -saɪ- /
especially British, parasitise

verb (used with object)

parasitized, parasitizing
  1. to live on (a host) as a parasite.


parasitize British  
/ -saɪ-, ˈpærəsɪˌtaɪz /

verb

  1. to infest or infect with parasites

  2. to live on (another organism) as a parasite

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Other Word Forms

Etymology

Origin of parasitize

First recorded in 1885–90; parasite + -ize

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

"They parasitize the shells of bivalves like oysters, not the flesh of the animals themselves," said Nanglu.

From Science Daily • Nov. 5, 2025

To understand orca parasites, she had been trying to study organisms that parasitize salmon, a favorite orca prey that might pass the parasites along to the whales.

From Science Magazine • May 7, 2024

But many parasitologists like Wood focus on multicellular metazoans: animals that encompass hundreds of thousands of species, including up to 300,000 different types of worms that parasitize vertebrates alone.

From Scientific American • May 18, 2022

The birds sometimes raise their eggs in cooperative groups and sometimes parasitize other species’ nests.

From Nature • Feb. 24, 2019

Two roundworms were found to parasitize the guts of the salamanders; the parasitism looks to be benign.

From Natural History of the Salamander, Aneides hardii by Johnston, Richard F.

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