Definition of "but-" []

• Used as a combining form to denote the presence of 4 carbon atoms in the parent chain when forming names of organic compounds. (prefix)

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• "Probably is running for president, so we're going to be talking a lot more about him, James, but-"
• "The intense, Oscar-winning "Bad" is anything but- a first-rate ensemble piece that will keep you glued to the final credits."
• "I mean, that's the real potential game changer, but-"