Y

n. (Far.) A disease of the bile in horses, cattle, and sheep, causing yellowness of the eyes; jaundice. (Bot.) A disease of plants, esp. of peach trees, in which the leaves turn to a yellowish color; jeterus. (Zool.) A group of butterflies in which the predominating color is yellow. It includes the common small yellow butterflies. Called also redhorns, and sulphurs. See Sulphur.