How Do You Spell TONUSES?
Pronunciation: [tˈə͡ʊnəsɪz] (IPA) 
The spelling of the word "tonuses" can be confusing. It is pronounced as /ˈtoʊnəsɪz/ and is the plural form of "tonus" which means the normal level of tension and firmness in a muscle. The word follows the regular English plural rule of adding "es" to words ending in "s," "x," "z," "ch," and "sh." However, some people mistakenly spell it as "tonus" or "toni" when referring to more than one tense muscle. To avoid confusion, remember to add "es" when spelling the plural form of "tonus."
