Error: Treating the Combining Vowel as Part of the Root
This video presents the same text shown beside it, spoken and on screen. It adds nothing the text does not say.
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The combining vowel belongs to the combining form, not to the word root, so a term uses either the root or the combining form.
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Gastritis uses the root gastr; gastroscopy uses the combining form gastr slash o.
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Treating gastro as the root predicts gastroitis, which is not a word.