Parasite

/ˈpæɹəˌsaɪt/ noun, verb, slang

noun, verb, slang ·Common ·High school level

Meaning at a glance

  • Primary sense: An organism that lives on or in another organism of a different species, deriving benefit from living on or in that other organism, while not contributing towards that other organism sufficiently to cover the cost to that other organism.
  • Grammar: parasite is listed as noun, verb, slang.
  • Nearest alternatives: leech, sponger, adherent, algae.
  • Useful contrasts: benefactor, commensal, donor.
  • Usage evidence: The brain may be regarded as a kind of parasite of the organism, a pensioner, as it were, who dwells with the body.

How to use "parasite"

  1. Start with the primary definition, then check the part of speech before placing the word in a sentence.
  2. Compare nearby synonyms to make sure "parasite" carries the exact meaning, tone, and strength you need.
  3. Use the example sentence as a context check. If your sentence uses the word differently, confirm that the grammar still fits.

Meaning check

  • Does the word fit the sentence's grammar?
  • Does it match the intended tone rather than only the dictionary definition?
  • Would a simpler synonym be clearer for the reader?
  • Is there enough surrounding context to prevent ambiguity?

Source and review context

This entry combines structured lexical data with WordToolSet review checks. Definitions, examples, synonyms, and usage notes may come from different source tables, so the page is designed to show evidence from more than one angle before you rely on "parasite" in a final draft.

If a word has several senses, prefer the sense that matches your sentence's grammar and surrounding context. A correct definition can still be the wrong choice when the sentence needs a different register, emphasis, or level of specificity.

Before you rely on this definition

Read the first definition as a starting point, then check the example, synonyms, and part of speech before treating "parasite" as the right word for your sentence.

If your draft is formal, technical, persuasive, or sensitive, compare "parasite" with a nearby alternative so the final choice matches both meaning and reader expectation.

Compare nearby meanings

  • Use synonyms when you need a softer, stronger, simpler, or more specific word.
  • Use antonyms to check the boundary of the meaning and avoid accidental contrast.
  • Use the example sentence to confirm the word behaves naturally in context.
  • Keep the original wording when a replacement adds complexity without improving precision.

Definition decision workflow

1. Identify the role

Check whether "parasite" is acting as noun, verb, slang in your sentence. A definition is only useful when the grammar matches the way the word is being used.

2. Test the nearest option

Compare it with "leech" and other nearby choices to see whether the sentence needs a softer, stronger, or more familiar word.

3. Confirm with context

Use the example sentence below as an evidence check, then read your own sentence out loud to catch tone or rhythm problems.

Review note: Definition pages are checked for source coverage, sentence evidence, synonym support, and editorial insight before they are treated as approval-ready pages. If the evidence is too thin, the page remains available to users but is kept out of the approval-facing indexed inventory.

Final meaning check

Before publishing a sentence with "parasite", ask whether the word helps the reader understand the idea faster. A precise word should reduce confusion, not simply make the sentence look more polished.

When the definition, synonym evidence, and example context point in the same direction, the word is usually a safer choice. When they conflict, revise the sentence or choose a clearer alternative.

Definitions

Noun
  1. 1
    An organism that lives on or in another organism of a different species, deriving benefit from living on or in that other organism, while not contributing towards that other organism sufficiently to cover the cost to that other organism.

    "Lice, fleas, ticks, and mites are widely spread parasites."

  2. 2
    an animal or plant that lives in or on a host (another animal or plant); it obtains nourishment from the host without benefiting or killing the host wordnet
  3. 3
    An organism that lives on or in another organism of a different species, deriving benefit from living on or in that other organism, while not contributing towards that other organism sufficiently to cover the cost to that other organism.; An internal parasite that is an animal or protist. informal, specifically

    "He lacks, however, even the basic Dr. Kildare lingo about medical issues. For instance, he regularly misidentifies poppers as amyl nitrate, instead of amyl nitrite — two forms of heart medicine with different affects ^([sic]). Salmonella, a bacteria, is not usually classified as a parasite. And he mistakenly writes, "lenti means slow" in the lentiviruses. ("Lenti" means lens-shaped, biologists classify by structure, not by behavior.)"

  4. 4
    a follower who hangs around a host (without benefit to the host) in hope of gain or advantage wordnet
  5. 5
    A person who lives on other people's efforts or expense and gives little or nothing back. derogatory

    "A royalist who publicly called for a military intervention to protect the parasite monarchy."

Show 5 more definitions
  1. 6
    A sycophant or hanger-on. derogatory
  2. 7
    A climbing plant which is supported by a wall, trellis etc. literary, poetic

    "Her golden tresses shade / The bosom's stainless pride, / Curling like tendrils of the parasite / Around a marble column."

  3. 8
    A retainer or companion of an ancient Celtic warrior, who praised him in song or poetry at gatherings; a bard. historical
  4. 9
    A component of a composite aircraft which is carried aloft and air-launched by a larger carrier aircraft or mother ship to support the primary mission of the carrier; a parasite aircraft.

    "[…] parasiting and aerial refueling as range-extension measures. Second, parasiting would be exorbitantly expensive, because each parasite bomber would need its own carrier. Two bombers could be serviced by a single tanker, however,[…]"

  5. 10
    An isolated (FSDU) (freestanding display unit ) attributive

    "parasite display"

Verb
  1. 1
    To parasitize. rare

    "... parasiting upon her husband, taking everything and giving nothing in return, this woman had brought her husband to a condition of serious ill health because of his grief, anxiety, and despair over her failure."

Antonyms

benefactorcommensaldonorfree-living organism

Example

"The brain may be regarded as a kind of parasite of the organism, a pensioner, as it were, who dwells with the body."

Common questions

What does "parasite" mean?

An organism that lives on or in another organism of a different species, deriving benefit from living on or in that other organism, while not contributing towards that other organism sufficiently to cover the cost to that other organism.

What is a synonym for "parasite"?

Common synonyms include: leech, sponger, adherent, algae, appendage, attendance.

How do you use "parasite" in a sentence?

The brain may be regarded as a kind of parasite of the organism, a pensioner, as it were, who dwells with the body.

How do you pronounce "parasite"?

Pronounced /ˈpæɹəˌsaɪt/.

Etymology

From Middle French parasite, from Latin parasitus, from Ancient Greek παράσιτος (parásitos, “person who eats at the table of another”), from noun use of adjective meaning "feeding beside", from παρά (pará, “beside”) + σῖτος (sîtos, “food”).

More for "parasite"