1) Catatonia 2) Catatonic 3) Hypertonia 4) Hypertonus 5) Hypotonia 6) Hypotonus 7) Myotonia 8) Myotonic 9) Tonicity 1) Muscle property 2) Muscle tension 3) Normal state of muscle tissue 4) Tautness 5) Tenseness 6) Tension 7) Tensity 8) Tone 9) Tonicity 
Tonus is the Latin equivalent of the English word tone. It is especially used to refer to: ...
normal elasticity of healthy muscle at rest
• (n.) Tonicity, or tone; as, muscular tonus.
(to´nәs) tone or tonicity; the slight, continuous contraction of a muscle, which in skeletal muscles aids in the maintenance of posture and in the return of blood to the heart.
To'nus noun [ Latin a sound, tone. See Tone .] (Physiol.) Tonicity, or tone; as, muscular tonus . 
Type: Term Pronunciation: tō′nŭs Synonyms: tonicity1