urinator

Etymology

From Latin ūrīnātor (“diver”), from ūrīnārī + -tor (suffix forming a (masculine) agent noun). Ūrīnārī is the present active infinitive of ūrīnor (“to plunge under water, dive”), possibly from ūrīna (“urine; water (?)”), ultimately from Proto-Indo-European *h₂wer- (“to moisten; to flow”).