Online Medical DictionaryMedTerms™

  1. MedTerms medical dictionary is the medical reference for MedicineNet.com. Our doctors define difficult medical language in easy-to-understand explanations of over 16,000 medical terms.
  2. Medterms online medical dictionary provides quick access to hard-to-spell and often misspelled medical definitions through an extensive alphabetical listing.

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If you know the spelling, use the search function above to look up the meaning of the medical term in MedTerms and find related medical articles on MedicineNet.com. If you're not sure of the spelling (medical misspellings are common), type the first few letters, followed by an asterisk(*).

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Cleft lip: A fissure in the upper lip that is due to failure of the left and right sides of the fetal lip tissue to fuse, an event that should take place by...

Full medical definition for Cleft lip »
Related Article: Cleft Lip and Cleft Palate main article »


A Note to Healthcare Professionals: The MedTerms online medical dictionary is written with consumers and patients in mind. Here are other medical reference books recommended by our doctors:

  • Dorland's Illustrated Medical Dictionary
  • Mosby's Medical Dictionary
  • Stedman's Medical Dictionary
  • Taber's Cyclopedic Medical Dictionary

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