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tonic
tonic accent
tonic sol-fa
tonic water
tonicity
tonight
tonk
tonka bean
Tonkin, Gulf of
Tonle Sap
tonnage
tonne
tonneau
tonneau cover
tonometer
tonoplast
tons
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tonus
to·nus [ tṓnəss ]


noun 
Definition:
 
normal state of muscle: the normal state of a healthy muscle when resting in a state of slight contraction
[Late 19th century. Via Latin< Greek tonos "tension, tone"]
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