Hydra

geographical name

Hy·​dra ˈhī-drə 

variants or Modern Greek Ídhra

ˈēt͟h-rä 

island of Greece in the southern Aegean Sea off the east coast of the Peloponnese area 20 square miles (52 square kilometers), population 2794

Hydriot

ˈhī-drē-ət 

-drē-ˌät

noun

or Hydriote

ˈhī-drē-ˌōt 

-ət

Kids Definition

hydra

noun

hy·​dra

ˈhī-drə

: any of numerous small tube-shaped freshwater animals related to the jellyfishes and having a mouth surrounded by tentacles at one end

Medical Definition

hydra

noun

hy·​dra ˈhī-drə 

: any of numerous small tubular freshwater hydrozoan polyps (Hydra and related genera) having at one end a mouth surrounded by tentacles