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halogen (n.)
general name for elements of the chlorine family, 1842, from Swedish, coined by Swedish chemist Baron Jöns Jakob Berzelius (1779-1848), literally "salt-producer," from Greek hals "salt" (from PIE root *sal- "salt") + -gen "giving birth to" (see -gen); so called because a salt is formed in reactions involving these four elements. Related: Halogenous.
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*sal- 
Proto-Indo-European root meaning "salt."

It forms all or part of: hali-; halide; halieutic; halite; halo-; halogen; sal; salad; salami; salary; saline; salmagundi; salsa; salsify; salt; salt-cellar; saltpeter; sauce; sausage; silt; souse.

It is the hypothetical source of/evidence for its existence is provided by: Greek hals "salt, sea;" Latin sal, Old Church Slavonic soli, Old Irish salann, Welsh halen, Old English sealt, German Salz "salt."
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halide (n.)
a compound of a halogen and a metal radical, 1844, from Swedish (Berzelius, 1825), from halo- + chemical suffix -ide.
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