planarian

noun
pla·​nar·​i·​an | \ plə-ˈner-ē-ən How to pronounce planarian (audio) \

Definition of planarian

: triclad especially : any of various dark-colored freshwater triclad flatworms (family Planariidae) with two eyespots and a triangular head

Examples of planarian in a Sentence

Recent Examples on the Web But upon decapitation, the frontmost part of the remaining planarian can assume the duties of the now-missing head. Ed Yong, The Atlantic, 8 Oct. 2021 The biologist Thomas Hunt Morgan once estimated that a full planarian could regenerate from just one 279th of its body. Ed Yong, The Atlantic, 8 Oct. 2021 After two weeks, a complete and healthy animal—a planarian of Theseus—crawled away. Ed Yong, The Atlantic, 8 Oct. 2021 The most astonishing part was that Levin hadn’t touched the planarian’s genome. Matthew Hutson, The New Yorker, 3 May 2021 Severance occurs when the tail tip adheres to the substratum and the rest of the planarian pulls away. Chris Ciaccia, Fox News, 23 May 2018 For the planarian, the researchers were able to identify roughly 1,000 likely genes that are probably specific to these organisms. John Timmer, Ars Technica, 25 Jan. 2018 That's exactly what happened with earlier attempts to sequence the planarian and axolotl genomes. John Timmer, Ars Technica, 25 Jan. 2018 Reader Terri Shofner then alerted us to Ho's video of the odd-looking creature, which experts say is likely an unknown species of the genus Bipalium, known by the common names hammerhead worm and broadhead planarian. Liz Langley, National Geographic, 15 July 2017 See More

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

First Known Use of planarian

1854, in the meaning defined above

History and Etymology for planarian

New Latin Planaria

Learn More About planarian

Time Traveler for planarian

Time Traveler

The first known use of planarian was in 1854

See more words from the same year

Dictionary Entries Near planarian

planaria

planarian

planariform

See More Nearby Entries 

Statistics for planarian

Cite this Entry

“Planarian.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/planarian. Accessed 30 Jun. 2022.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

More Definitions for planarian

planarian

noun
pla·​nar·​i·​an | \ -ē-ən How to pronounce planarian (audio) \

Medical Definition of planarian

: any of the family Planariidae or order Tricladida comprising small soft-bodied ciliated mostly aquatic turbellarian worms

Other Words from planarian

planarian adjective

More from Merriam-Webster on planarian

Britannica English: Translation of planarian for Arabic Speakers

Britannica.com: Encyclopedia article about planarian

WORD OF THE DAY

Test Your Vocabulary

Words Named After People

  • name tags
  • Namesake of the leotard, Jules Léotard had what profession?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
Universal Daily Crossword

A daily challenge for crossword fanatics.

TAKE THE QUIZ
Love words? Need even more definitions?

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