Hydrus definitions

hī'drəs
A constellation in the Southern Hemisphere near Tucana and Mensa.
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A S constellation near the celestial pole.
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(astronomy) A winter constellation of the southern sky, said to resemble a small serpent. It lies between the constellations Mensa and Tucana. It is not to be confused with the constellation Hydra.
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Origin of hydrus

Named by Dutch explorers Pieter Dirkszoon Keyser and Frederick de Houtman between 1595 and 1597. From Latin hydrus, a "water serpent", originally from Ancient Greek Ύδρα (Hydra)