chlorine

[klawr-een, -in, klohr-]
noun
a halogen element, a heavy, greenish-yellow, incombustible, water-soluble, poisonous gas that is highly irritating to the respiratory organs, obtained chiefly by electrolysis of sodium chloride brine: used for water purification, in the making of bleaching powder, and in the manufacture both of chemicals that do not contain chlorine, as ethylene glycol, and of those that do. Symbol: Cl; atomic weight: 35.453; atomic number: 17.

Origin:
1800–10; chlor-1 + -ine2

chlorinous, adjective
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Collins
World English Dictionary
chlorine or chlorin (ˈklɔːriːn, ˈklɔːrɪn)
 
n
a toxic pungent greenish-yellow gas of the halogen group; the 15th most abundant element in the earth's crust, occurring only in the combined state, mainly in common salt: used in the manufacture of many organic chemicals, in water purification, and as a disinfectant and bleaching agent. Symbol: Cl; atomic no: 17; atomic wt: 35.4527; valency: 1, 3, 5, or 7; density: 3.214 kg/m³; relative density: 1.56; melting pt: --101.03°C; boiling pt: --33.9°C
 
[C19 (coined by Sir Humphrey Davy): from chloro- + -ine², referring to its colour]
 
chlorin or chlorin
 
n
 
[C19 (coined by Sir Humphrey Davy): from chloro- + -ine², referring to its colour]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

chlorine
coined 1810 by Sir Humphry Davy (1778-1829) from Gk. khloros "pale green" (see Chloe). Named for its color. Discovered 1774, but known at first as oxymuriatic acid gas.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

chlorine chlo·rine (klôr'ēn', -ĭn)
n.
Symbol Cl
A highly irritating poisonous halogen, capable of combining with nearly all other elements, produced principally by electrolysis of sodium chloride and used widely to purify water, as a disinfectant and bleaching agent, and in the manufacture of many important compounds. Atomic number 17; atomic weight 35.45; freezing point -101.5°C; boiling point -34.0°C; specific gravity 1.56 (-33.6°C); valence 1, 3, 5, 7.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
chlorine   (klôr'ēn')  Pronunciation Key 
Symbol Cl
A greenish-yellow, gaseous element of the halogen group that can combine with most other elements and is found chiefly in combination with the alkali metals as chlorates and chlorides. Chlorine is highly irritating and poisonous. It is used in purifying water, as a disinfectant and bleach, and in the manufacture of numerous chemical compounds. Atomic number 17; atomic weight 35.453; freezing point -100.98°C; boiling point -34.6°C; specific gravity 1.56 (-33.6°C); valence 1, 3, 5, 7. See Periodic Table. See Note at chlorophyll.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary
chlorine [(klawr-een, klawr-in)]

A chemical element, normally a corrosive gas, that is widely used for sterilization and cleaning.

Note: Chlorine is added to drinking water to kill bacteria.
Note: Chlorine in CFCs is believed to be responsible for the ozone hole.
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
Your kids can only bob in the water for so long before the chlorine turns their
  hair a luminescent green.
The authors weren't so careful when they chose the other electrode, as they
  used silver, which can react with chlorine.
Sometimes it's a about molten sodium and chlorine gas.
The chlorine reacts with the oxygen atoms in ozone and rips apart the ozone
  molecule.
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