(n.) A serpent or monster in the lake or marsh of Lerna, in the
Peloponnesus, represented as having many heads, one of which, when cut
off, was immediately succeeded by two others, unless the wound was
cauterized. It was slain by Hercules. Hence, a terrible monster.
(n.) Hence: A multifarious evil, or an evil having many sources;
not to be overcome by a single effort.
(n.) Any small fresh-water hydroid of the genus Hydra, usually
found attached to sticks, stones, etc., by a basal sucker.
(n.) A southern constellation of great length lying southerly
from Cancer, Leo, and Virgo.
