The most common and most likely answer to this crossword clue is the 8 letter word HALOGENS
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More clues leading to the result HALOGENS
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What does HALOGENS mean?
HALOGENS noun- Any element of group 17, i.e. fluorine, chlorine, bromine, iodine and astatine, which form a salt by direct union with a metal.
- A light fixture in which the filament is surrounded by an atmosphere of a halogen gas,