Webster's 1828 Dictionary
GILTHEAD
n.[gilt and head. ] In ichthyology, a fish or a genus of fishes, the Sparus, of many species; so named from their color, or from a golden spot between the eyes. 1. A bird.
Webster's 1913 Dictionary
GILTHEAD
GILTHEAD Gilt "head `, n. (Zoöl.)
Defn: A marine fish. The name is applied to two species: (a ) The Pagrus, or 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.
The Wordsmith Dictionary