Definition of hazardous adjective from the Oxford Advanced Learner's Dictionary

 

hazardous

 adjective
adjective
BrE BrE//ˈhæzədəs//
 
; NAmE NAmE//ˈhæzərdəs//
 
 
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involving risk or danger, especially to somebody’s health or safety hazardous waste/chemicals a hazardous journey It would be hazardous to invest so much. a list of products that are potentially hazardous to health Word Origin mid 16th cent.: from French hasardeux, from hasard ‘chance’, from Spanish azar, from Arabic az-zahr ‘chance, luck’, from Persian zār or Turkish zar ‘dice’.Extra examples burning potentially hazardous medical waste chemicals that are hazardous to human beings environmentally hazardous substances Britain produces almost five million tonnes of hazardous waste each year. They attached a list of products that are potentially hazardous to health. They endured a hazardous journey through thickening fog.
See the Oxford Advanced American Dictionary entry: hazardous