arbor

noun

1. A shelter of vines or branches or of latticework covered with climbing shrubs or vines

noun

1. A spindle or axle of a wheel
2. A main shaft or beam
3. A shaft on which a revolving cutting tool is mounted
4. A spindle on a cutting machine that holds the work to be cut

combining form

1. Tree

   "arboriculture"

noun

1. A day designated for planting trees

geographical name

1. City in southeastern Michigan west of Detroit population 113,934