
1) Constellation 2) Constellation, Water Serpent 3) Constellation, Water Snake
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https://www.crosswordclues.com/clue/hydrus

1) Water snake
Found on
https://www.crosswordclues.com/clue/hydrus

Phoenix (corner) Hydrus s is a small constellation in the deep southern sky. It was first depicted on a celestial atlas by Johann Bayer in his 1603 Uranometria. The French explorer and astronomer Nicolas Louis de Lacaille charted the brighter stars and gave their Bayer designations in 1756. Its name means `male water snake`, as opposed to Hydra,.....
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http://en.wikipedia.org/wiki/Hydrus
[Chinese astronomy] The modern constellation Hydrus is not included in the Three Enclosures and Twenty-Eight Mansions system of traditional Chinese uranography because its stars are too far south for observers in China to know about them prior to the introduction of Western star charts. Based on the work of Xu Guangqi and the German Jesuit ...
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http://en.wikipedia.org/wiki/Hydrus_(Chinese_astronomy)
[equivalents in Chinese astronomy] ...
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http://en.wikipedia.org/wiki/Hydrus_(equivalents_in_Chinese_astronomy)
[legendary creature] The Hydrus (also known as Enhydros, Enidros, Hildris, Hydra, Idra, Idres, Ydre, Ydris, and Ydrus) is a creature from Medieval bestiaries. They were said to be found in the Nile River. While in the Nile, a crocodile would roll the hydrus in the mud before eating the smaller creature. However, once inside the crocodile`s ...
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http://en.wikipedia.org/wiki/Hydrus_(legendary_creature)
[software] Hydrus is a suite of Windows-based modeling software that can be used for analysis of water flow, heat and solute transport in variably saturated porous media (e.g., soils). HYDRUS suite of software is supported by an interactive graphics-based interface for data-preprocessing, discretization of the soil profile, and graphic pres...
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http://en.wikipedia.org/wiki/Hydrus_(software)

• (n.) A constellation of the southern hemisphere, near the south pole.
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http://thinkexist.com/dictionary/meaning/hydrus/
(abbr. Hyi, gen. Hydri) The Little Water Snake. Hydrus is a small, faint constellation of the far southern sky (not to be confused with Hydra), partly sandwiched between the two Magellanic Clouds. See below for details of the constellation's brightest stars. Hydrus. &cop...
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http://www.daviddarling.info/encyclopedia/H/Hyi.html

English name: The Small Water-Snake Hydri. Genitive name: Hyi. Visibility: Never visible from the UK. See TABLE 20: THE CONSTELLATIONS.
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http://www.encyclo.co.uk/local/20448

Fabulous water snake or water weasel. Its Greek name is related to that of the English otter described in bestiaries as covering itself with mud in order to slip down the crocodile's throat and...
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http://www.encyclo.co.uk/local/20688
Hy'drus noun [ Latin , a water serpent; also, a certain constellation, Greek
'y`dros .]
(Astron.) A constellation of the southern hemisphere, near the south pole.
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http://www.encyclo.co.uk/webster/H/78

[
n] - a constellation in the southern hemisphere near the south celestial pole
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http://www.webdictionary.co.uk/definition.php?query=Hydrus

the Water Snake, a southern constellation between Eridanus and Octans.
Found on
https://www.infoplease.com/dictionary/hydrus
No exact match found.