Englishfor English speakers
chlorine
Noun
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A chemical element (symbol Cl) with an atomic number of 17.
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Chlorine can mean something that contains chlorine, but is not chlorine as an element
Drinking water and swimming pool water is chlorinated to make it clean.
laser
Noun
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A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation.
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The term laser originated as an acronym for "light amplification by stimulated emission of radiation".