Definition of Hydrus in English:

Hydrus

Syllabification: Hy·drus
Pronunciation: /ˈhīdrəs
 
/
Astronomy
1An inconspicuous southern constellation (the Water Snake), between the star Achernar and the south celestial pole. Compare with Hydra (sense 2).
1.1 (as genitive Hydri /-drī/) Used with a preceding letter or numeral to designate a star in this constellation: the star Delta Hydri

Origin

Latin, from Greek hudros.

Definition of Hydrus in:

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Pronunciation: ˈsiːtəʊs
adjective
bearing bristles or setae; bristly