(är′bər) noun
1. A bower, as of latticework, supporting vines or trees; a place shaded by trees.
2. Obs. An orchard. Also Brit, ar′bour. [Earlier erber, herber <AF, var. of OF erbier, herbier <L herbarium a collection of herbs <herba grass, herb]

(är′bər) noun plural ar·bo·res (är′bər·ēz) for defs. 1 and 3, ar·bors for def 2.
1. A tree: used chiefly in botanical names.
2. Mech. a A shaft, mandrel, spindle, or axle, as of a circular saw, lathe, or watch wheel, b A principal support of a machine.
3. A pictured genealogical tree. [<L, tree]