PLA'NE-TREE, n. [L. platanus.] A tree of the genus Platanus. The oriental plane-tree is a native of Asia; it rises with a straight smooth branching stem to a great highth, with palmated leaves and long pendulous peduncles, sustaining several heads of small close sitting flowers. The seeds are downy,and collected into round, rough, hard balls. The occidental plane-tree, which grows to a great highth, is a native of N. America; it is called also button-wood.