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Definition of chlorine : 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.

Synonyms:

centilitre, centiliter, Cl, atomic number 17

rhenium, zinc, osmium, indium, thallium, astatine, antimony, fluorine, nobelium, cerium, phosphorus, lead, sulfur, yttrium, americium, tungsten, europium, tellurium, erbium, rhodium, neodymium, boron, iridium, magnesium, chromium, manganese, einsteinium, platinum, strontium, element, cadmium, fermium, bismuth, mendelevium, bromine, tantalum, plutonium, gallium, uranium, titanium, ruthenium, lanthanum, cesium, palladium, gadolinium, holmium, cobalt, curium, iron, promethium, aluminum, hafnium, molybdenum, nickel, polonium, terbium, sodium, copper, praseodymium, krypton, mercury, niobium, technetium, berkelium, calcium, selenium, radon, germanium, thorium, potassium, carbon, radium, scandium, lithium, samarium, lutetium, silver, beryllium, californium, dysprosium, gold, zirconium, francium, tin, barium, protactinium, silicon, arsenic, vanadium, ytterbium, actinium, thulium, rubidium, neptunium, iodine

atmosphere, butane, neon, ether, ethane, gas, ammonia, hydrogen, laughing gas, oxygen, xenon, methane, carbon monoxide, nitrogen, miasma, fume, tear gas, carbon dioxide, mustard gas, nerve gas, ozone, rarefaction, vapor, natural gas, acetylene, helium, argon

Usage examples:

• When warmed with black oxide of manganese and strong sulphuric acid it gives off chlorine, recognized by its smell and bleaching properties. - "Aids to Forensic Medicine and Toxicology", W. G. Aitchison Robertson.
• Let us follow the chlorine, which is a yellowish- green gas, more than twice as heavy as air, and has found a new use as poison gas in the great war- for which all the world should be ashamed. - "Kelly Miller's History of the World War for Human Rights", Kelly Miller.
• The ultimate source of salt deposits is the sodium and chlorine of igneous rocks. - "The Economic Aspect of Geology", C. K. Leith.