Căs'si-do-ny, n.

n. [Cf. L. Lat. cassidomium, cachedonius, cacedonius, chalcedonius, chalcedony, properly from Chalcedon, a town in Bithynia; Fr. cassidoine.] (Bot.) (a.) A species of Gnaphalium, cottonweed, cudweed, or goldylocks. (b.) A species of Lavandula stæchas, or French lavender.