| chlorine | | |
| n. (substance) | 1. atomic number 17, chlorine, cl | a common nonmetallic element belonging to the halogens; best known as a heavy yellow irritating toxic gas; used to purify water and as a bleaching agent and disinfectant; occurs naturally only as a salt (as in sea water). |
| ~ chemical element, element | any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter. |
| ~ radiochlorine | a radioactive isotope of chlorine. |
| ~ common salt, sodium chloride | a white crystalline solid consisting mainly of sodium chloride (NaCl). |
| ~ gas | a fluid in the gaseous state having neither independent shape nor volume and being able to expand indefinitely. |
| ~ halogen | any of five related nonmetallic elements (fluorine or chlorine or bromine or iodine or astatine) that are all monovalent and readily form negative ions. |
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