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Longtime rival of 42-Across
Answer for the clue "Longtime rival of 42-Across ", 6 letters:
hydrox
Alternative clues for the word hydrox
Word definitions for hydrox in dictionaries
Wikipedia
Word definitions in Wikipedia
Hydrox , a gas mixture of hydrogen and oxygen , was used as a breathing gas in very deep diving . It allows divers to descend several hundred metres. Precautions are necessary when using hydrox, since mixtures containing more than a few percent of both ...