hidrosisPronunciation: /hɪˈdrəʊsɪs/Definition of hidrosis noun [mass noun] Medicine the action of sweating. Derivatives hidroticPronunciation: /-ˈdrɒtɪk/ adjective Origin: mid 19th century: from Greek hidrōsis, from hidrōs 'sweat'hidrosis in other Oxford dictionaries Definition of hidrosis in the US English dictionary