hydra
noun
Often Hydra a water or marsh serpent with nine heads, each of which, if cut off, grew back as two; Hercules killed this serpent by cauterizing the necks as he cut off the heads.
Hydrae
-
genitive of
hydra.
hydrae
-
pluralof hydra.plural
The grammatical form denoting more than one person, place, thing, or idea.
hydranounOften Hydra a water or marsh serpent with nine heads, each of which, if cut off, grew back as two; Hercules killed this serpent by cauterizing the necks as he cut off the heads.
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
EX Hydrae exists in a binary system alongside a normal main sequence star.
From Science Daily ● Jan. 8, 2026
In EX Hydrae, the magnetic field is not strong enough to direct all incoming material onto the star's magnetic poles.
From Science Daily ● Jan. 8, 2026
The mission's ability to measure the polarization of X-rays allowed astronomers to closely examine EX Hydrae, a type of system known as an intermediate polar.
From Science Daily ● Jan. 8, 2026
The infalling matter collides with other material bound to the white dwarf, forming tall columns of hot gas that emit intense X-rays, making systems like EX Hydrae ideal targets for IXPE.
From Science Daily ● Jan. 8, 2026
They have a model, a most ingenious affair run by clockwork, at the University of Konkrook, to show the apparent movement and position of Beta Hydrae in the sky; it does so fairly accurately.
From Uller Uprising by John D. Clark
