HYDRA
, a southern constellation, consisting of a number of stars, imagined to represent a water serpent. The stars in the constellation Hydra, in Ptolomy's catalogue, are 27; in Tycho's, 19; in Hevelius's, 31; and in the Britannic catalogue, 60.
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Entry taken from A Mathematical and Philosophical Dictionary, by Charles Hutton, 1796.
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