1. a salt of hydrochloric acid consisting of two elements, one of which is chlorine, as sodium chloride, NaCl.
  2. a compound containing chlorine, as methyl chloride, CH3Cl.


  1. any salt of hydrochloric acid, containing the chloride ion Cl
  2. any compound containing a chlorine atom, such as methyl chloride (chloromethane), CH 3 Cl

“compound of chlorine and another element,” 1812, coined by Sir Humphrey Davy (1778-1829) from chlorine + -ide on the analogy of oxide.


  1. A binary compound of chlorine.

  1. A compound, such as ammonium chloride, containing chlorine and another element or radical.

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