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Glossary
- Oncology
- The study of cancer.
- Opioid
- A substance used to treat moderate to severe pain. Opioids are like opiates, such as morphine and codeine, but are not made from opium. Opioids bind to opioid receptors in the central nervous system. Opioids used to be called narcotics. An opioid is a type of alkaloid.
- Opportunistic infection
- An infection in a person whose immune system is suppressed, caused by an organismAn individual living thing. that does not usually trouble people with healthy immune systems.
- Organism
- An individual living thing.
- Osteoporosis
- A condition that is marked by a decrease in bone mass and density, causing bones to become fragile.
- Oto-
- Pertaining to the ear.
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