Hydra - Definition
hydra
n 1: (Greek mythology) monster with nine heads; when struck off
each head was replaced by two new ones; "Hydra was slain by
Hercules"
2: a long faint constellation in the southern hemisphere near
the equator stretching between Virgo and Cancer [syn:
Hydra, Snake]
3: 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"
4: small tubular solitary freshwater hydrozoan polyp