tono-, -tonia, -tone, -tony, -tonic, -tonical (tension) +

The element tono- is a combining form with the meanings "stretching, tension, tone", used in the formation of compound words.

The suffix element -tonia is a combining form with the meanings of "muscle tension" or "nerve tension"; as specified by the initial element: hypertonia; used also in the formation of words that denote more generally a personality type or personality disorder; for example, catatonia and somatotonia.