• Any perennial woody plant of considerable size (usually over twenty feet high) and growing with a single trunk. • Something constructed in the form of, or considered as resembling, a tree, consisting of a stem, or stock, and branches; as, a genealogical tree. • A piece of timber, or something commonly made of timber; -- used in composition, as in axletree, boottree, chesstree, crosstree, whiffletree, and the like. • A cross or gallows; as Tyburn tree. • Wood; timber. • A mass of crystals, aggregated in arborescent forms, obtained by precipitation of a metal from solution. See Lead tree, under Lead. • To drive to a tree; to cause to ascend a tree; as, a dog trees a squirrel. • To place upon a tree; to fit with a tree; to stretch upon a tree; as, to tree a boot. See Tree, n., 3.