pien.[OE. pie, pye; cf. Ir. & Gael. pighe pie, also Gael. pige an earthen jar or pot. Cf. Piggin.]1. An article of food consisting of paste baked with something in it or under it; as, chicken pie; venison pie; mince pie; apple pie; pumpkin pie.()2. See Camp, n., 5.(Halliwell.)Pie crust, the paste of a pie.()n.[F. pie, L. pica; cf. picus woodpecker, pingere to paint; the bird being perhaps named from its colors. Cf. Pi, Paint, Speight.]1. (Zol.) A magpie.()2. (R. C. Ch.) The service book.()3. (Pritn.) Type confusedly mixed. See Pi.()By cock and pie, an adjuration equivalent to by God and the service book. Shak. -- Tree pie (Zol.), any Asiatic bird of the genus Dendrocitta, allied to the magpie. -- Wood pie. (Zol.) See French pie, under French.()v. t. See Pi.()