Health Glossary

Demystifying medical language. Browse or search for clear, human-centered explanations of common medical terms.

Obesity

A chronic, complex disease characterized by excessive or abnormal accumulation of body fat that can impair health. Obesity results from…
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Oncology

The branch of medicine concerned with the prevention, diagnosis, study, treatment, and management of cancer. Oncology encompasses many areas, including…
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Organelle

A specialized structure within a cell that performs a particular function necessary for the cell’s survival, maintenance, or activity. Organelles…
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Organism

An individual living entity capable of carrying out the processes necessary to maintain life and, where applicable, reproduce. An organism…
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Oxidation

Oxidation is a chemical process in which a substance loses electrons, often accompanied by changes involving oxygen or other chemical…
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