tonus

noun

to·​nus ˈtō-nəs 

: tone sense 9b

especially : a state of partial contraction characteristic of normal muscle

Examples of tonus in a Sentence

Recent Examples on the Web

The Federal Aviation Agency study notes that kids, especially those under the age of 4, have more flexible skeletons, more relaxed muscle tonus, and a higher proportion of subcutaneous fat, which helps protect internal organs. —Dan Koeppel, Popular Mechanics, 14 Feb. 2021

Word History

Etymology

New Latin, from Latin, tension, tone

First Known Use

1876, in the meaning defined above

Medical Definition

tonus

noun

to·​nus ˈtō-nəs 

1

: tone sense 2a

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