To save this word, you'll need to log in.
Rey·nolds number | \ ˈre-nᵊldz- 
\
\Definition of Reynolds number
: a number characteristic of the flow of a fluid in a pipe or past an obstruction
Keep scrolling for more
Comments on Reynolds number
What made you want to look up Reynolds number? Please tell us where you read or heard it (including the quote, if possible).
Test Your Vocabulary
Semantic Drift Quiz
- Which of the following was once a synonym for fun?
Can you spell these 10 commonly misspelled words?
TAKE THE QUIZ
Test Your Knowledge - and learn some interesting things along the way.
TAKE THE QUIZLove words? Need even more definitions?
Merriam-Webster unabridgedWords at Play
Ask the Editors
Word Games
- Semantic Drift Quiz
A challenging quiz of changing words.
Take the quiz - A Thanksgiving Word Quiz
We are thankful for obscure words.
Take the quiz - Spell It
Can you spell these 10 commonly misspelled words?
Take the quiz - Dictionary Devil
The dictionary has been scrambled—can you put it back together?
Play the game
Share Reynolds number
Time Traveler for Reynolds number
The first known use of Reynolds number was in 1910
See more words from the same year