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.