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

Keep scrolling for more

Examples of planarian in a Sentence

Recent Examples on the Web Severance occurs when the tail tip adheres to the substratum and the rest of the planarian pulls away. Chris Ciaccia, Fox News, "Massive 18-inch hammerhead worms are invading France," 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, "A salamander with a genome 10 times the size of ours regrows lost limbs," 25 Jan. 2018 That's exactly what happened with earlier attempts to sequence the planarian and axolotl genomes. John Timmer, Ars Technica, "A salamander with a genome 10 times the size of ours regrows lost limbs," 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, "Watch a Mysterious Worm With an Anus for a Mouth," 15 July 2017

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.

See More

First Known Use of planarian

1854, in the meaning defined above

History and Etymology for planarian

New Latin Planaria

Keep scrolling for more

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

Statistics for planarian

Cite this Entry

“Planarian.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/planarian. Accessed 12 December 2019.

Keep scrolling for more

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

Comments on planarian

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

WORD OF THE DAY

a period of high artistic development

Get Word of the Day daily email!

Test Your Vocabulary

Semantic Drift Quiz

  • a twisty river
  • Which of the following was once a synonym for fun?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Bee Cubed

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

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!