nocturnal

play
adjective noc·tur·nal \näk-ˈtər-nəl\

Definition of nocturnal

  1. 1 :  of, relating to, or occurring in the night a nocturnal journey nocturnal activities

  2. 2 :  active at night a nocturnal predator nocturnal insects, such as mosquitoes

nocturnally

play \-nəl-ē\ adverb

Examples of nocturnal in a Sentence

  1. he bought a new telescope so he could pursue his favorite nocturnal hobby of astronomy

Recent Examples of nocturnal from the Web

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'nocturnal'. Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

Origin and Etymology of nocturnal

Middle English, from Anglo-French or Late Latin; Anglo-French nocturnel, from Late Latin nocturnalis, from Latin nocturnus of night, nocturnal, from noct-, nox night


NOCTURNAL Defined for English Language Learners

nocturnal

play
adjective

Definition of nocturnal for English Language Learners

  • : active mainly during the night

  • : happening at night


NOCTURNAL Defined for Kids

nocturnal

play
adjective noc·tur·nal \näk-ˈtər-nəl\

Definition of nocturnal for Students

  1. 1 :  happening at night a nocturnal journey

  2. 2 :  active at night nocturnal insects


Medical Dictionary

nocturnal

play
adjective noc·tur·nal \näk-ˈtərn-əl\

Medical Definition of nocturnal

  1. 1:  of, relating to, or occurring at night nocturnal myoclonus

  2. 2:  characterized by nocturnal activity a nocturnal form of filariasis



Seen and Heard

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

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

WORD OF THE DAY

set in a bent position

Get Word of the Day daily email!

Test Your Vocabulary

The Emoji Quiz

  • emoji-the-quiz
  • What phase of the moon is this: 🌖 ?
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!