Halogen meaning

hăl'ə-jən
Any of a group of five chemically related nonmetallic elements including fluorine, chlorine, bromine, iodine, and astatine.
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Of or relating to the group of elements that are halogens.
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Of or relating to a bright incandescent light bulb containing a halogen gas that prevents the filament from disintegrating at higher temperatures.
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Any of the five very reactive, nonmetallic chemical elements making up group VIIA of the periodic table: fluorine is the lightest and most reactive of the group, and astatine is the heaviest and least reactive.
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Any of a group of five nonmetallic elements with similar properties. The halogens are fluorine, chlorine, bromine, iodine, and astatine. Because they are missing an electron from their outermost shell, they react readily with most metals to form salts.
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(chemistry) Any element of group 7, i.e. fluorine, chlorine, bromine, iodine and astatine, which form a salt by direct union with a metal.
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Origin of halogen

From Ancient Greek ἅλς (hals, “salt”) + -gen (“produce”), referring to elements which produce a salt in union with a metal.