Mid 17th century. Apparently associated with India as a result of early confusion regarding the bird's origin; compare post-classical Latin Gallus Indicus and earlier cock of Ind.
Definition of Indian cock in US English:
Indian cock
noun
rare
The turkey.
Origin
Mid 17th century. Apparently associated with India as a result of early confusion regarding the bird's origin; compare post-classical Latin Gallus Indicus and earlier cock of Ind.