MYOTONIA Meaning of MYOTONIA in English [ ˌmʌɪə(ʊ)'təʊnɪə ]■ noun Medicine inability to relax voluntary muscle after vigorous effort.Derivativesmyotonic adjective OriginC19: from myo- + Gk tonos 'tone'. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004