What is the term for the combination of a root and a vowel used to aid pronunciation in medical terminology?

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The term for the combination of a root and a vowel used to aid pronunciation in medical terminology is the combining form. It’s formed by adding a combining vowel—usually o—to a root so it can smoothly connect with another root or with a suffix or prefix. This makes multi-part terms easier to pronounce, as in gastr/o linking to other word parts to form words like gastroenterology.