SINCE 1828
dictionary
thesaurus

Alethopteris

noun
Save Word
Al·​e·​thop·​ter·​is | \ ˌa-lə-ˈthäp-tə-rəs \

Definition of Alethopteris

: a genus of large fossil seed ferns represented by abundant remains in Carboniferous coal measures and having large bipinnate to tripinnate fronds with the thick pinnules being inserted on the rachis by a broad decurrent base

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

  • More than 250,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

Other Words from Alethopteris

alethopteroid \ ¦a-​lə-​¦thäp-​tə-​ˌrȯid \ adjective

First Known Use of Alethopteris

circa 1847, in the meaning defined above

History and Etymology for Alethopteris

New Latin, from Greek alētho- (from alēthēs true) + New Latin -pteris

Learn More About Alethopteris

Time Traveler for Alethopteris

Time Traveler

The first known use of Alethopteris was circa 1847

See more words from the same year

Dictionary Entries Near Alethopteris

alethic

Alethopteris

alette

See More Nearby Entries 

Statistics for Alethopteris

Cite this Entry

“Alethopteris.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Alethopteris. Accessed 4 Jul. 2022.

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

WORD OF THE DAY

Yankee

Listen to the pronunciation of Yankee

See Definitions and Examples »

Test Your Vocabulary

Which Word Does Not Belong?

  • one green toy robot amidst many red toy robots
  • Which of these words does not mean "nonsense"?
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!

Words at Play
Ask the Editors
Word Games