Definition of tree
1 a
: a woody perennial plant having a single usually elongate main stem generally with few or no branches on its lower part
b
: a shrub or herb of arborescent form
- rose trees
- a banana tree
2
: something in the form of or resembling a tree: such as
a
: a diagram or graph that branches usually from a simple stem or vertex without forming loops or polygons
- a genealogical tree
- phylogenetic trees
b
: a much-branched system of channels especially in an animal body
- the vascular tree
3 a (1)
: a piece of wood (such as a post or pole) usually adapted to a particular use or forming part of a structure or implement
(2)
archaic
: the cross on which Jesus was crucified
4
: saddletree
