Obs. rare. App. = estridge (ostrich) feather; applied to some peculiarity in the coat of a horse.
1685. Lond. Gaz., No. 2524/4. A bright Bay Horse with a Bob Tail, and three Estery Feathers, one at his breast, and one at each side of his Neck. Ibid. A brown Roan Mare … the hair curleth almost like an Estery Feather.
