hazel [hazels](tree / shrub) noun [UK: ˈheɪz.l̩] [US: ˈheɪz.l̩]A truffle is a fungus which lives in symbiosis with the roots of certain plants, such as oak, hazel, beech, poplar and willow trees. = La trufa es un hongo que vive en simbiosis con las raíces de algunas plantas, tales como robles, avellanos, hayas, álamos y sauces.