American Heritage Dictionary
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Century Dictionary
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GNU Webster's 1913
WordNet
Elsewhere on the web
Caveaux themselves, where proofs of their guilt will spring up hydra-headed from the very ground. "— Jack Harkaway's Boy Tinker Among The Turks Book Number Fifteen in the Jack Harkaway Series
Probably the fact that he had raised his wife from that condition kept the hydra-headed system continually before him.— Clotelle: a Tale of the Southern States
If self sets to work to slay self it will only end in rising hydra-headed from the contest.— Parables of the Christ-life
Fear hydra-headed terror still begets; --— Polyeucte
The hydra-headed monster every now and then lifts a new front, and must be smitten again.— History of Woman Suffrage, Volume III (of III)

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