<p><strong>Noun</strong></p><ul><li>the usually round, red or yellow, edible fruit of a small tree, Malus sylvestris, of the rose family.</li><li>the tree, cultivated in most temperate regions.</li><li>the fruit of any of certain other species of tree of the same genus.</li><li>any of these trees.</li><li>any of various other similar fruits, or fruitlike products or plants, as the custard apple, love apple, May apple, or oak apple.</li><li>Informal: anything resembling an apple in size and shape, as a ball, especially a baseball.</li><li>Bowling: an ineffectively bowled ball.</li><li>Slang: a red capsule containing a barbiturate, especially secobarbital.</li></ul>