Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† hydrĭa, ae, f., = ὑδρία (a water-pot; hence, in gen.),
† hydrĭus, a, um, adj. [ὕδωρ], of or be longing to water, water-: puer (for Aquarius), the constellation of the Waterman, Prud. Apoth. 622.