sanitarian UK /ˌsæn.ɪˈtɛəɹi.ən/US /ˌsæ.nɪˈtɛɹi.ən/noun 2adjective 1forms 1 noun2 •(US) A public health or sanitation worker. •(historical) A person who promoted sanitary reforms. adjective1 •Of or pertaining to health, or the laws of health; sanitary. formssanitarians