Definitions for "Tonus"
Tonicity, or tone; as, muscular tonus.
A low level of muscular tension that is maintained even when the body is at rest.
the elastic tension of living muscles, arteries, etc. that facilitate response to stimuli; "the doctor tested my tonicity"
The normal state of slight contraction of the pupil which is affected by innervation of the autonomic nervous system.
Slight continuous contraction of muscle.