Noun arbor has 3 senses
  1. arbor - tree (as opposed to shrub)
    --1 is a kind of
    tree
    Derived forms: verb arborize1, verb arborise1
  2. spindle, mandrel, mandril, arbor - any of various rotating shafts that serve as axes for larger rotating parts
    --2 is a kind of rotating shaft, shaft
    --2 is a part of drive
  3. arbor, arbour, bower, pergola - a framework that supports climbing plants; "the arbor provided a shady resting place in the park"
    --3 is a kind of framework, frame, framing
    --3 has particulars: grape arbor, grape arbour
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