The Collaborative International Dictionary of English v.0.48:

Yellows \Yel"lows\, n.
   1. (Far.) A disease of the bile in horses, cattle, and sheep,
      causing yellowness of the eyes; jaundice.
      [1913 Webster]

            His horse . . . sped with spavins, rayed with the
            yellows.                              --Shak.
      [1913 Webster]

   2. (Bot.) A disease of plants, esp. of peach trees, in which
      the leaves turn to a yellowish color; jeterus.
      [1913 Webster]

   3. (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.
      [1913 Webster]