Source : Webster's Revised Unabridged Dictionary (1913)

Chlorine \Chlo"rine\, n. [Gr. ? pale green, greenish yellow. So
   named from its color. See {Yellow}.] (Chem.)
   One of the elementary substances, commonly isolated as a
   greenish yellow gas, two and one half times as heavy as air,
   of an intensely disagreeable suffocating odor, and
   exceedingly poisonous. It is abundant in nature, the most
   important compound being common salt. It is powerful
   oxidizing, bleaching, and disinfecting agent. Symbol Cl.
   Atomic weight, 35.4.

   {Chlorine family}, the elements fluorine, chlorine, bromine,
      and iodine, called the {halogens}, and classed together
      from their common peculiarities.