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Wiktionary
unbranched

a. 1 Having no branches 2 (context organic chemistry English) straight-chain

WordNet
unbranched

adj. without branches; "a tree with an unbranched trunk" [syn: unbranching]

Usage examples of "unbranched".

For the last hundred meters into town an impenetrable living palisade of cactus lined the road on both sides, unbranched spiny green columns that had been planted one flush against the next.

It was waving to and fro, as a single unbranched plant might, and the whistling came from it, as if a dying man were trying to breathe.

I was shown a photograph of a 14-foot straight and unbranched specimen, which had grown up in a sheltered spot.