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The Collaborative International Dictionary
Hermodactylus tuberosus

Snake's-head \Snake's"-head`\, n. (Bot.) The Guinea-hen flower; -- so called in England because its spotted petals resemble the scales of a snake's head.
--Dr. Prior.

Snake's-head iris (Bot.), an iridaceous plant ( Hermodactylus tuberosus) of the Mediterranean region. The flowers slightly resemble a serpent's open mouth.