protonema

noun
pro·​to·​ne·​ma | \ ˌprō-tə-ˈnē-mə How to pronounce protonema (audio) \
plural protonemata\ ˌprō-​tə-​ˈnē-​mə-​tə How to pronounce protonema (audio) , -​ˈne-​ \

Definition of protonema

: the primary usually filamentous thalloid stage of the gametophyte in mosses and in some liverworts comparable to the prothallus in ferns

Other Words from protonema

protonemal \ ˌprō-​tə-​ˈnē-​məl How to pronounce protonema (audio) \ adjective
protonematal \ ˌprō-​tə-​ˈnē-​mə-​tᵊl How to pronounce protonema (audio) , -​ˈne-​ How to pronounce protonema (audio) \ adjective

First Known Use of protonema

1857, in the meaning defined above

History and Etymology for protonema

New Latin protonemat-, protonema, from prot- + Greek nēma thread — more at nemat-

Keep scrolling for more

Learn More about protonema

Time Traveler for protonema

Time Traveler

The first known use of protonema was in 1857

See more words from the same year

Statistics for protonema

Cite this Entry

“Protonema.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/protonema. Accessed 27 Jan. 2021.

More from Merriam-Webster on protonema

Britannica.com: Encyclopedia article about protonema

Comments on protonema

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

WORD OF THE DAY

Test Your Vocabulary

Slippery Words Quiz—Changing with the Times

  • ducreux self portrait yawning
  • What is an earlier meaning of nice?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

TAKE THE QUIZ
Typeshift

Anagram puzzles meet word search.

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!