from the GNU version of the Collaborative International Dictionary of English
- n. an arctic American ptarmigan (Lagopus rupestris), which in winter is white, with the tail and lores black. In summer the males are grayish brown, coarsely vermiculated with black, and have black patches on the back.
Sorry, no etymologies found.
He came upon a valley where rock ptarmigan rose on whirring wings from the ledges and muskegs.