This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. Body or muscular tone; tonicity.

n. tonicity; tone

n. Tonicity, or tone.

n. A condition of preparedness in an organ or tissue to perform its normal function as soon as the customary stimulus is applied.

n. Tonicity.

n. Tonic spasm.

n. the elastic tension of living muscles, arteries, etc. that facilitate response to stimuli

"In the frog's tongue, capillary tonus is very strongly developed, in that by far the majority are completely contracted."

tautness    tenseness    tensity    tension   

tonus perefrrinus    reflex tonus    tonus regius   

myotonia    hypertonia    muscle tone    hypotonicity    hypertonicity    hypertonus    hypotonus    catatonia    hypotonia    muscular tonus   

sanguification    single-service    flyspeck    fasciculations    cockchafer    vomitus    incoordination    six-one    temporomandibular    asthenopia