What does hydra mean ?

hy·dra

/ˈhīdrə/

noun

a minute freshwater coelenterate with a tubular body and a ring of tentacles around the mouth.

Explanation:

via Latin from Greek hudra ‘water snake’ (see Hydra), named by Linnaeus because, if cut into pieces, each section can grow into a whole animal

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those characteristics are cellular organization, reproduction, metabolism, homeostasis, heredity, response to stimuli, growth and development, and adaptation through evolution. some things, such as a virus, demonstrate only a few of these characteristics and are, therefore, not alive