Exceptionally dangerous or risky, beyond the level of ordinary hazard or danger.
From Latin 'extra' (beyond) + 'hazardous' (dangerous, from Old French 'hasard' meaning game of chance, possibly from Arabic 'az-zahr' meaning the dice). The compound emerged in occupational safety terminology during the 20th century.
Insurance companies classify certain jobs as 'extrahazardous'—like deep-sea welding or high-altitude window cleaning—and charge premiums reflecting risks that most of us would never accept!
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