What is the biblical meaning of wood?

Answer 1

The physical substance we know as wood is the same they knew in Bible times. Some species may be now extinct or unidentifiable but wood is still wood. It was important for building, furniture, tools, and fire etc then as now.

There is a connection with idolatry though, as many of the Canaanite tribes had idol worship which involved trees. But apart from this wrong use wood was good.

Wood can represent human nature unless the wood is alive, i.e. "the branch" which is Christ. But wood (usually dead wood or planed or milled wood) represents a corruptible material (human nature.). The ark of the covenant was wood overlaid with gold to make it presentable unto the Lord.