sidalceaPronunciation: /sɪˈdalsɪə/Definition of sidalcea noun a herbaceous North American plant of the mallow family, several kinds of which are cultivated as ornamentals. Genus Sidalcea, family Malvaceae Origin:modern Latin, from Sida + Alcea, names of related generasidalcea in other Oxford dictionaries Definition of sidalcea in the US English dictionary