Source : Webster's Revised Unabridged Dictionary (1913)

      Of rubies, sapphires, and pearles white.    --Chaucer.

   2. The color of a ruby; carmine red; a red tint.

            The natural ruby of your cheeks.      --Shak.

   3. That which has the color of the ruby, as red wine. Hence,
      a red blain or carbuncle.

   4. (Print.) See {Agate}, n., 2. [Eng.]

   5. (Zo["o]l.) Any species of South American humming birds of
      the genus {Clytol[ae]ma}. The males have a ruby-colored
      throat or breast.

   {Ruby of arsenic}, {Ruby of sulphur} (Chem.), a glassy
      substance of a red color and a variable composition, but
      always consisting chiefly of the disulphide of arsenic; --
      called also {ruby sulphur}.

   {Ruby of zinc} (Min.), zinc sulphide; the mineral zinc blende
      or sphalerite.

   {Ruby silver} (Min.), red silver. See under {Red}.