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.
For human-created art using rocks, see Rock balancing. A balancing rock, also called balanced rock or precarious boulder, is a naturally occurring geological formation featuring a large rock or boulder, sometimes of substantial size, resting on other rocks, bedrock, or on glacial till.