'Hydrus' definitions:
Definition of 'Hydrus'
From: WordNet
noun
A constellation in the southern hemisphere near the south celestial pole
Definition of 'Hydrus'
From: GCIDE
- Hydrus \Hy"drus\, n. [L., a water serpent; also, a certain constellation, Gr. "y`dros.] (Astron.) A constellation of the southern hemisphere, near the south pole. [1913 Webster]