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used in The Lightning Thief

only 1 use
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Greek mythology:  a monster with nine heads; when struck off each head was replaced by two new ones

or more generally (as a common noun):

trouble that cannot be overcome by a single effort because of its many aspects or its persistent and pervasive quality
  • The plaque read, HYDRA HEAD #1, WOODSTOCK, N.Y., 1969.
    Chapter 9 (60% in)

There are no more uses of "Hydra" in The Lightning Thief.

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