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From The Collaborative International Dictionary of English v.0.48:
Gilthead \Gilt"head`\, n. (Zool.) A marine fish. The name is applied to two species: (a) The Pagrus auratus (syn. Chrysophrys auratus), a valuable food fish common in the Mediterranean (so named from its golden-colored head); -- called also giltpoll. (b) The Crenilabrus melops, of the British coasts; -- called also golden maid, conner, sea partridge. [1913 Webster]