Hydra (Noun)
Meaning 1
Small tubular solitary freshwater hydrozoan polyp.
Classification
Nouns denoting animals.
Hypernyms
Meaning 2
(Greek mythology) monster with nine heads; when struck off each head was replaced by two new ones; "Hydra was slain by Hercules".
Classification
Nouns denoting people.
Hypernyms
Meaning 3
A long faint constellation in the southern hemisphere near the equator stretching between Virgo and Cancer.
Classification
Nouns denoting natural objects (not man-made).
Synonyms
Meaning 4
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".
Classification
Nouns denoting cognitive processes and contents.