ARBOUR, originally "herber" or "erber" (O.Fr. herbier, from Lat. herbarium, "a collection of herbs," herba, "grass") ; the word came to be spelt "artier" through its pronunciation, as in the case of Derby, and by the i6th century was written "ar bour," helped by a confusion of derivation from Lat. arbor, a tree, and by change of meaning. A grass-plot or lawn, a herb garden and a shady bower of interlaced trees, or climbing plants trained on lattice-work. The application of the word has shifted from the grass-covered ground to the covering of trees overhead. is a term applied to the spindle of a wheel, particularly in clock-making.