OPV

Oral polio vaccine. See Polio vaccine, oral.

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OR (abbreviation)
Stands for “operating room”. A facility equipped for performing surgery. OR is sometimes written O.R.
Oral
Having to do with the mouth. For example, an oral solution is a solution that is given by mouth.
Oral allergy syndrome
A type of allergic cross reactivity that occurs in people who are highly sensitive to pollen. The oral allergy syndrome is also known as or pollen-food allergy syndrome and is thought to be a type of contact allergy related to the presence of proteins in certain foods that cross react with allergy-causing pollen proteins. During […]

Oral aversion
Reluctance, avoidance, or fear of eating, drinking, or accepting sensation in or around the mouth. A familiar example of oral aversion is a baby’s refusal to breastfeed. Types of medical trauma such as prolonged intravenous or nasogastric feeding, gastrointestinal and respiratory disorders that may be associated with discomfort with eating may also contribute to the […]
Oral cancer
Cancer within the mouth. Oral cancer is associated with smoking cigarettes and cigars as well as chewing tobacco. It is generally noticed as a painless growth on the inner cheek, gum, or tongue. Treatment options include surgical resection, radiation, and/or chemotherapy.