These days, it seems like you can't watch TV or read a magazine without hearing or reading about health or medical topics. Your doctor, pharmacist, insurance company or therapist may also toss out a word or phrase with which you are not familiar.

You hear the term antioxidant all the time - in the news, in advertisements - but what is an antioxidant, and what does it mean to you? Look it up in our Glossary! When using Healthline's Glossary, simply type your term into our Search box or, if it's too hard to spell, find it through our A-Z directory. Healthline provides free definitions from respected health-care references such as Stedman's Medical Dictionary, ADAM Health Illustrated Encyclopedia and Thomson Gale Encyclopedias. Other online glossaries and dictionaries cover millions of topics. Healthline Glossary covers one - health!

Be sure to check back frequently, as we update it regularly with more terminology from a wide range of reputable sources. Trust Healthline Glossary for medically accurate information about the health topics that concern you.