Health Glossary

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

Platelet

A platelet (thrombocyte) is a tiny cell fragment that helps stop bleeding by forming blood clots. Platelets are produced in…
View Definition →

Pneumonia

An infection or inflammatory condition affecting lung tissue, particularly the parts of the lungs involved in gas exchange. Pneumonia can…
View Definition →

Polymer

A polymer is a substance made of large molecules composed of many repeating chemical units linked together into long chains…
View Definition →

Pregnancy

Pregnancy is the period during which a baby develops inside the uterus, beginning after implantation and ending with childbirth. It…
View Definition →

Printing Ink

Printing ink is a formulation containing pigments, dyes, binders, solvents, additives, or other components used to create printed images, text,…
View Definition →

Prognosis

The expected course, outcome, or future health effects of a disease or medical condition. A prognosis is an informed estimate…
View Definition →

Prokaryote

An organism whose cells lack a membrane-bound nucleus and other membrane-bound organelles characteristic of eukaryotic cells. Prokaryotes include bacteria and…
View Definition →

Protozoa

Protozoa are diverse microscopic, single-celled organisms, some of which can live as parasites and cause disease in humans. Protozoa are…
View Definition →

Public Health

Public health is the field concerned with protecting and improving the health of populations through prevention, health promotion, policy, surveillance,…
View Definition →

Pustule

A pustule is a small, raised skin lesion containing visible purulent material. In acne, pustules develop when inflammation within or…
View Definition →