Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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a tough nut to crack a problem or situation that is difficult to solve or cope with. [2 definitions]
betel nut the nut of the betel palm, chewed together with betel pepper leaves and lime in southeastern Asia as a mild stimulant and narcotic.
Brazil nut a large, oily triangular nut, the seed of a large tropical South American tree, or the tree itself.
ivory nut the hard, ivorylike seed of a small South American palm, used for buttons, ornaments, and the like.
kola nut the seed of the kola tree, which contains caffeine and theobromine and is used in soft drinks and medicines.
locknut a thin nut screwed over another nut in order to stop it from coming loose. [2 definitions]
nut case (slang) one who is unbalanced or crazy.
pine nut the sweet, edible, nutlike seed of certain pines that grow chiefly in the southwestern United States and Mexico; pignolia.
wing nut a nut with two winglike projections for thumb and forefinger leverage when the nut is turned.