The terms osteoarthritis and gastroenterology are both examples of using a combining vowel?

Actually, the terms "osteoarthritis" and "gastroenterology" do not specifically illustrate the use of a combining vowel; rather, they showcase the use of combining forms. In "osteoarthritis," "osteo-" (bone) and "Arthritis" (inflammation of joints) are combined, while "gastroenterology" combines "gastro-" (stomach) and "entero-" (intestine) with "logy" (study of). The combining vowel, typically "o," is often used in medical terminology to connect roots and suffixes, but in these examples, the combining forms are directly linked without a combining vowel.