单词	tonus
释义	tonus noun to·​nus ˈtō-nəs  : tone sense 9b especially : a state of partial contraction characteristic of normal muscle Example Sentences 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
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