Then Merriam Webster's Medical Dictionary is the way to go. With more than 40,000 medical terms and definitions you can find the meaning of any word you need.

Note: The following information is intended to supplement, not substitute for, the expertise and judgement of your physician, pharmacist or other healthcare professional. It should not be construed to indicate that the use of the drug is safe, appropriate, or effective for you. Please consult your healthcare professional before taking this drug.