Oral/ˈɔːrəl/ Definition 1 of 4Pro Tip 1/2Health Focus Use 'oral' when talking about anything involving the mouth, especially in healthcare contexts. Maintaining good oral hygiene prevents gum disease. Pro Tip 2/2Dental Specific In dentistry, 'oral' is commonplace and can refer to procedures, regions, or conditions of the mouth. She specializes in oral surgery.