Found 2 items, similar to tonus.
English → English (WordNet) Definition: tonus tonus n : the elastic tension of living muscles, arteries, etc. that facilitate response to stimuli; “the doctor tested my tonicity” [syn: tonicity, tone] [ant: atonicity]
English → English (gcide) Definition: Tonus Tonus \To"nus\, n. [L. a sound, tone. See Tone.] (Physiol.) Tonicity, or tone; as, muscular tonus. [1913 Webster]