American Heritage Dictionary
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Century Dictionary
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GNU Webster's 1913
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WordNet
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Some of these appear immediately and require consideration before a satisfactory curriculum can be developed, but most of them are hydra-headed, and one phase is no sooner settled than another arises.— The Making of a Trade School
This creature is known as the hydra.— Chatterbox, 1906
In the first place, they, like the hydra, start as single individuals, but sooner or later develop little buds which grow out into arm-bearing creatures exactly like themselves; but these, instead of breaking off as in the hydra, remain fixed and themselves produce branches, which again branch, and so on, until, as you will readily see, in a very short time a colony of animals is produced which bears a remarkable resemblance to a little tree!— Chatterbox, 1906
She made no further attempt therefore to cure what she called her lover's crotchets, and Gamelin remained firm in the conviction that Jacques Maubel was Ιlodie's seducer Through the days that ensued the Tribunal devoted its undivided attention to the task of crushing Federalism, which, like a hydra, had threatened to devour Liberty.— Dieux ont soif. English
Nothing yet in my bottle like a hydra.— Country Walks of a Naturalist with His Children

American Heritage Dictionary (1)
Century Dictionary (1)
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