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Medical and Science Glossaries

The following glossaries contain definitions to terms related to rare and/or genetic diseases, clinical research, and general health topics. Unless otherwise noted, the glossaries are in English language only.

Genetic Terms
Disease-Specific Glossaries
Clinical Research
General Health Topics


Dictionary Name



Genetic Terms

National Human Genome Research Institute

NHGRI’s Talking Glossary of Genetic Terms

Terms used in genetic research – many definitions include images, animation and links to related terms

English and Spanish

National Library of Medicine

Illustrated Glossary

GeneReviews Term and definitions – many include case examples.

National Institute of General Medical Sciences

The New Genetics Glossary

Terms used in the National Institute of General Medical Sciences science education booklet entitled “The New Genetics”.

Department of Energy

Genome Glossary

Glossary of genetic terms from the DOE Human Genome Program

Disease-Specific Glossaries

National Cancer Institute

NCI Dictionary of Cancer Terms

Cancer Terms

National Institute of Allergy and Infection Diseases

Health & Research Topics A-Z

Allergy and infectious disease health and research topics

National Institute on Deafness and Other Communications Disorders


Glossary of medical terms for deafness and other communication disorders

National Institute of Diabetes and Digestive and Kidney Diseases

The Kidney Failure Glossary

Terms that relate to kidney failure and its treatment

National Heart, Lung, and Blood Institute

NHLBI’s Health Topics

Definitions related to heart, lung, and blood diseases and conditions and sleep disorders.

English and Spanish

Clinical Research

National Institute of Neurological Disorders and Stroke

NINDS Glossary of Clinical Research Terms

Terms related to clinical research

National Institute of Mental Health

A Participants Guide to Mental Health Clinical Research

Terms related to clinical research


NIH Office of Extramural Research

Grants and Funding Glossary & Acronym List

Terms related to NIH grants and funding

General Health Topics

National Library of Medicine

MedlinePlus Health Topics

Definitions for many health conditions

National Library of Medicine

Medical Dictionary

Medical dictionary by Merriam-Webster Inc.

National Center for Complementary and Alternative Medicine

Health Topics A-Z

Glossary that includes terms for complementary and alternative medicine