a tropical plant of the genus Musa, certain species of which are cultivated for their nutritious fruit. Compare banana family.
the fruit, especially that of M. paradisiaca, with yellow or reddish rind.
any of several tropical and subtropical herbaceous treelike plants of the musaceous genus Musa, esp M. sapientum, a widely cultivated species propagated from suckers and having hanging clusters of edible fruit
the crescent-shaped fruit of any of these plants Compare plantain2
In addition to the idiom beginning with banana also see: drive someone crazy (bananas) go bananas top banana