Exposed to or involving danger; perilous; risky.The terms “hazardous,” “extra-hazardous,” “specially hazardous,” and “not hazardous”are well-understood technical terms In the business of insurance, havingdistinct and separate meanings. Although what goods are included in each designationmay not be so known as to dispense with actual proof, the terms themselves aredistinct and known to be so. Russell v. Insurance Co., 50 Minn. 409. 52 N. W. 906;Pindar v. Insurance Co.. 3S N. T. 365.