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medical dictionary online

Many terms frequently used in science and medicine are derived from latin words. By combining the root words with, prefixes and suffixes many of the meanings of the terms can be deciphered.

Use the following resources to better understand medical terms:

Medical Roots or Stems
Prefixes commonly used in medical terms
Suffixes commonly used in medical terms

Complete Glossary of Medical Root Words

a b c d e f g h i j k l m n o p q r s t u v w x y z

obstruction blockage in the gastrointestinal tract
occluded artery an artery narrowed by plaque (effects blood flow)
occult disease or systems not readily detectable by physical exam
olfaction act of smelling
oncogenes genes that promote normal cell division
oncologist specializes in treatment and study of cancer
orchiectomy surgical removal of the testicles
oropharynx part of the throat in the back of the mouth
orthostatic hypotension

large decrease in blood pressure; may result in fainting

osteoblast cell found in bone
osteocyte cell found within the bone; its function to help maintain bone as living tissue
otosclerosis abnormal growth of bone in the inner ear, which prevents structures within the ear from working properly
ovaries pair of small glands, which egg cells develop and are stored
ovulation release of a mature egg from an ovary




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