gal·li·na·ceous \| ̷ ̷ ̷ ̷| ̷ ̷shəs\adjective Etymology: Latin gallinaceus of domestic fowl, from gallina hen (from gallus cock) + -aceus -aceous — more at gallus 1.: resembling a bird (as a domestic fowl) of the order Galliformes < gallinaceous pigeon > 2.: of or relating to the Galliformes < gallinaceous birds >