sphenopsid

noun
sphe·​nop·​sid | \ sfi-ˈnäp-səd How to pronounce sphenopsid (audio) \

Definition of sphenopsid

: any of a class or division (Sphenopsida or Sphenophyta) of primitive vascular plants characterized by jointed ribbed stems, small leaves usually in whorls at distinct stem nodes, and sporangia in sporangiophores and made up of the horsetails and extinct related forms

First Known Use of sphenopsid

1957, in the meaning defined above

History and Etymology for sphenopsid

ultimately from Greek sphēn wedge + New Latin -opsis

Keep scrolling for more

Learn More about sphenopsid

Time Traveler for sphenopsid

Time Traveler

The first known use of sphenopsid was in 1957

See more words from the same year

Statistics for sphenopsid

Cite this Entry

“Sphenopsid.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/sphenopsid. Accessed 6 Aug. 2020.

More from Merriam-Webster on sphenopsid

Britannica.com: Encyclopedia article about sphenopsid

Comments on sphenopsid

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

WORD OF THE DAY

Test Your Vocabulary

July 2020 Words of the Day Quiz

  • papercraft sunset
  • Which is a synonym of mien?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Syn City

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!