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say it: HAHY-druh
hydra is a noun meaning "(Greek mythology) monster with nine heads; when struck off each head was replaced by two new ones". It carries 4 recorded senses.
(Greek mythology) monster with nine heads; when struck off each head was replaced by two new ones
“Hydra was slain by Hercules”
Greek mythology
a long faint constellation in the southern hemisphere near the equator stretching between Virgo and Cancer
trouble that cannot be overcome by a single effort because of its many aspects or its persistent and pervasive quality
“we may be facing a hydra that defies any easy solution”
small tubular solitary freshwater hydrozoan polyp
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for hydra come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.