in Botany, a tree. Trees are by Linnæus classed in the seventh family of the vegetable kingdom, and are distinguished from shrubs in that their stems come up with buds on them; but this distinction holds not universally, there being rarely any buds on the large trees in India.

in Mechanics, the principal part of a machine, which serves to sustain the rest; also the axis or spindle on which a machine turns, as the arbor of a crane, windmill, &c.

ARBOR Dianæ. See Chemistry Index.