F region

noun

Definition of F region

: the highest region of the ionosphere occurring from 80 miles (130 kilometers) to more than 300 miles (500 kilometers)

First Known Use of F region

1923, in the meaning defined above

Keep scrolling for more

Learn More about F region

Time Traveler for F region

Time Traveler

The first known use of F region was in 1923

See more words from the same year

Statistics for F region

Cite this Entry

“F region.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/F%20region. Accessed 10 Aug. 2020.

Comments on F region

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

WORD OF THE DAY

Test Your Vocabulary

Original Meanings Quiz

  • rembrandt painting a young scholar and his tutor
  • Which of the following is the earliest known sense of the word awe?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Add Diction

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!