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> You need to invoke tree to define leaves and wood.

I don't think so?

All non-tree plants have leaves (almost all maybe? edit: not cacti, so not all but most). Wood can be defined biologically ("cellulose fibers embedded in a lignin matrix" or something like that)

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Non tree plants still require you assume what a tree is.

Ok, but all plants have leaves so you would only have to agree on what a plant is. You are trying to make a point but it makes no sense.

EDIT: you could also have totally separate definitions on what wood and leaves are without talking about trees or plants, don't you think?

Sure. But when most people think of plants they already use a tree like thing as mental model.

People who have only seen non tree plants doesn't exist.

And nor does any non tree plant leaves help you generate a tree leaf.

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