au·​to·​troph | \ ˈȯ-tə-ˌtrōf How to pronounce autotroph (audio) , -ˌträf \

Definition of autotroph

: an autotrophic organism

Examples of autotroph in a Sentence

Recent Examples on the Web Only those bacteria that had evolved into autotrophs survived. Robert F. Service, Science | AAAS, "This microbe no longer needs to eat food to grow, thanks to a bit of genetic engineering," 27 Nov. 2019

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

First Known Use of autotroph

1938, in the meaning defined above

History and Etymology for autotroph

German, from autotroph, adjective

Keep scrolling for more

Learn More about autotroph

Time Traveler for autotroph

Time Traveler

The first known use of autotroph was in 1938

See more words from the same year

Statistics for autotroph

Cite this Entry

“Autotroph.” Dictionary, Merriam-Webster, Accessed 23 Nov. 2020.

Keep scrolling for more

More Definitions for autotroph


au·​to·​troph | \ ˈȯt-ə-ˌtrōf How to pronounce autotroph (audio) , -ˌträf How to pronounce autotroph (audio) \

Medical Definition of autotroph

: an autotrophic organism

More from Merriam-Webster on autotroph Encyclopedia article about autotroph

Comments on autotroph

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


Test Your Vocabulary

Great Scrabble Words—A Quiz

  • scrabble tiles that read scrabble quiz
  • Which of the following Q-without-U words means the number five in cards or dice?
Spell It

Can you spell these 10 commonly misspelled words?

Add Diction

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!