furan - a colorless toxic flammable liquid used in the synthesis of nylon. furane, furfuran. organic compound - any compound of carbon and another element or a radical. nitrofuran - derivative of furan used to inhibit bacterial growth.
precarious adjective. âº in a âdangerous âstate because of not being âsafe or not being âheld in âplace âfirmly: The âlorry was âlodged in a very precarious way, with âits âfront âwheels âhanging over the âcliff.
Health Insurance Glossary. DEFINITION: A pre-existing condition is a medical condition that is excluded from coverage by an insurance company because the condition was believed to exist prior to the individual obtaining a policy from the particular insurance company.