1. having the size, form, or characteristics of a tree; treelike.

2. a term used by the French thinkers Deleuze and Guattari to characterise thinking marked by insistence on totalising principles, binarism and dualism. The term, first used in A Thousand Plateaus (1980) where it was opposed to the rhizome, comes from the way genealogy trees are drawn: unidirectional progress, with no possible retroactivity and continuous binary cuts (thus enforcing a dualist metaphysical conception, criticised by Deleuze).

Etymology: from Latin arborēscēns, present active participle of arborēscō, “become a tree”.

[Gill Rippingale]