cy·​to·​tox·​in | \ ˌsī-tə-ˈtäk-sən How to pronounce cytotoxin (audio) \

Definition of cytotoxin

: a substance (such as a toxin or antibody) having a toxic effect on cells

Examples of cytotoxin in a Sentence

Recent Examples on the Web Venoms contain cytotoxins, cardiotoxins, hemotoxins and neurotoxins, components of which can be used in the treatment of cancer and many other medical conditions. Malia Wollan, New York Times, "How to Hold a Venomous Snake," 30 June 2017

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'cytotoxin.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of cytotoxin

1900, in the meaning defined above

Keep scrolling for more

Learn More about cytotoxin

Time Traveler for cytotoxin

Time Traveler

The first known use of cytotoxin was in 1900

See more words from the same year

Statistics for cytotoxin

Cite this Entry

“Cytotoxin.” Dictionary, Merriam-Webster, Accessed 18 Feb. 2020.

Keep scrolling for more

More Definitions for cytotoxin


cy·​to·​tox·​in | \ ˌsīt-ə-ˈtäk-sən How to pronounce cytotoxin (audio) \

Medical Definition of cytotoxin

: a substance (as a toxin or antibody) having a toxic effect on cells

Comments on cytotoxin

What made you want to look up cytotoxin? Please tell us where you read or heard it (including the quote, if possible).


See Definitions and Examples »

Get Word of the Day daily email!

Test Your Vocabulary

More Confusing Words—Quiz

  • cats on impossible timber
  • The magician ______ moved the selected card to the top of the deck.
Spell It

Can you spell these 10 commonly misspelled words?

Syn City

Test Your Knowledge - and learn some interesting things along the way.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!