Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Scrabble
  • Spanish Central
  • Learner's Dictionary

tonus

play
noun to·nus \ˈtō-nəs\

Definition of tonus

  1. :  tone 9a; especially :  a state of partial contraction characteristic of normal muscle



Origin and Etymology of tonus

New Latin, from Latin, tension, tone


First Known Use: 1876


Medical Dictionary

tonus

play
noun to·nus \ˈtō-nəs\

Medical Definition of tonus

  1. 1:  tone 2a

  2. 2:  a state of partial contraction that is characteristic of normal muscle, is maintained at least in part by a continuous bombardment of motor impulses originating reflexly, and serves to maintain body posture—called also muscle tone; compare clonus




Seen and Heard

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

WORD OF THE DAY

of or relating to the heavens

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

dog-eating-apple

Which is a synonym of asperse?

placate beat divulge defame
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ