Precursor

A substance that the body can convert into the active form of a vitamin. One example is beta carotene, which the body can convert into vitamin A as needed.

Explore Medical Terms

20000+ Medical & Health Terms for Doctors, students & patients from a medical dictionary. Our experts define difficult medical & health language in easy-to-understand explanations of each and every medical term.

Medical & Health Terms online medical dictionary provides quick & easy access to hard-to-spell and often misspelled medical & health definitions through an extensive alphabetical A-Z listing.