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. [1913 Webster] {Snake's-head iris} (Bot.), an iridaceous plant ({Hermodactylus tuberosus}) of the Mediterranean region. The flowers slightly resemble a serpent's open mouth. [1913 Webster]