Plural of chlorine; multiple instances or forms of the chemical element chlorine, or various chlorine-based compounds used for disinfection.
From chlorine (the element discovered in 1774 by Carl Wilhelm Scheele) + the regular English plural suffix -s, used since the early 19th century in scientific literature.
Chlorine exists in many forms—as a toxic yellow-green gas, as dissolved compounds in water, and even in your table salt—making it one of chemistry's most versatile and essential elements.
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