bon ‧ sai /ˈbɒnsaɪ, ˈbəʊn- $ bɒːnˈsaɪ, ˈbɑːnsaɪ/ BrE AmE noun [uncountable and countable]
[ Date: 1900-2000 ; Language: Japanese ; Origin: 'tray planting' ]
a tree that is grown so that it always stays very small, or the art of growing trees in this way
—bonsai adjective