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noun

parasite

/ˈpærəsaɪt/  ·  say it: PAR·uh·syt

an organism that lives off a host, harming it

In Science & Nature

In more detail

1. (noun) an organism that lives on or in another organism and gets food from it, often causing harm

2. (noun) a person who relies on others for money or food without contributing anything in return

Examples

How to use parasite

Parasite is used literally in biology to describe organisms (like hookworms or lice) that live off a host organism, and figuratively to describe people who exploit others' generosity without reciprocating. The figurative sense is often derogatory and used to criticize freeloaders or those perceived as contributing nothing to society.

Common phrases

Synonyms

freeloader · sponger · leech · hanger-on · dependent

Opposites

benefactor · contributor · supporter

Word family

parasitic · parasitical · parasitically · parasitism · parasitize

A common mistake

Learners sometimes treat 'parasite' as countable when referring to the biological sense without an article (e.g., 'parasite causes disease' instead of 'a parasite causes disease' or 'parasites cause disease').

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