D region

noun

Definition of D region

: the lowest part of the ionosphere occurring approximately between 30 and 55 miles (50 and 90 kilometers) above the surface of the earth

First Known Use of D region

1930, in the meaning defined above

Keep scrolling for more

Learn More about D region

Dictionary Entries near D region

dreep

dreepy

dreg

D region

dregs of wine

dreich

dreid

Statistics for D region

Look-up Popularity

Time Traveler for D region

The first known use of D region was in 1930

See more words from the same year

Comments on D region

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

WORD OF THE DAY

characterized by aphorism

Get Word of the Day daily email!

Test Your Vocabulary

Farm Idioms Quiz

  • cow coming home
  • What does 'poke' refer to in the expression 'pig in a poke'?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
Word Winder's CrossWinder

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!