Merriam-Webster Logo
SINCE 1828
dictionary thesaurus view recents

nyctitropism

noun
Save Word
nyc·​tit·​ro·​pism | \ nikˈti‧trəˌpizəm \
plural -s

Definition of nyctitropism

: a sleep movement in plants characterized by response to a stimulus that is greatest or exclusively from one direction — compare nyctinasty

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!

History and Etymology for nyctitropism

International Scientific Vocabulary nyct- + -tropism

Keep scrolling for more

Learn More about nyctitropism

Statistics for nyctitropism

Cite this Entry

“Nyctitropism.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/nyctitropism. Accessed 25 January 2020.

Comments on nyctitropism

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

Show Comments  Hide Comments 

WORD OF THE DAY

lackluster

Listen to the pronounciation of lackluster

dull or mediocre

Get Word of the Day daily email!

Test Your Vocabulary

Intact Latin Quiz

  • roman tablet
  • What did focus mean in Latin?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Citation

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!

Words at Play
Ask the Editors
Word Games