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тонус meaning in English

BulgarianEnglish
тонус noun

tone [tones](firmness of a muscle or organ)
noun
[UK: təʊn] [US: ˈtoʊn]

tonicity [tonicities](The normal presence of tone or tension in a muscle or organ; tonus)
noun
[UK: tənˈɪsɪti] [US: tənˈɪsɪɾi]