prothallus

noun
pro·​thal·​lus | \ (ˌ)prō-ˈtha-ləs How to pronounce prothallus (audio) \

Definition of prothallus

1 : the gametophyte of a pteridophyte (such as a fern) that is typically a small flat green thallus attached to the soil by rhizoids
2 : a greatly reduced structure of a seed plant corresponding to the pteridophyte prothallus

Illustration of prothallus

Illustration of prothallus

prothallus 1: 1 antheridium, 2 archegonium, 3 rhizoid

First Known Use of prothallus

1854, in the meaning defined at sense 1

History and Etymology for prothallus

New Latin

Keep scrolling for more

Learn More about prothallus

Time Traveler for prothallus

Time Traveler

The first known use of prothallus was in 1854

See more words from the same year

Statistics for prothallus

Cite this Entry

“Prothallus.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/prothallus. Accessed 24 Sep. 2020.

Comments on prothallus

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

WORD OF THE DAY

Test Your Vocabulary

Homophone Quiz

  • three bears two of them look like theyre whispering to a third bear who looks chuffed to be the center of attention
  • In order to judge how people felt, the senator's office hired a firm to take a ______.
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Add Diction

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!