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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

idiopathic of unknown origin
ileal related to ileum
ileitis Chrohn's disease
ileocolitis irritation of the lower part of the small intestine (ileum)
ileostomy opening made in the abdomen for the removal of stool
ileum lwer end of the small intestine
immobilization preventing movement to allow for natural healing to take place
immune system complex network of specialized cells and organs that work together to defend the body against outside forces such as bacteria and viruses
immunoglobulin a type of antibody formed to protect the body from infection
immunology study of the body's immune system
immunosuppresive medications medications that prevent the body's immune system from reacting

treatment of allergy to substances, by giving gradually increasing does of the substance or allergen to which the person is allergic.

infection invasion of body of
infection invasion of the body by microorganisms that cause disease
inferior vena cava large blood vessel that returns blood from the legs to heart
inflammation swelling, redness, heat and pain all signify the bodies reaction to injury or disease
inotropic medications medications that increase the strength of heart constrictions
inspiration inhaling or taking in oxygen
insulin hormone producted by pancrease, affects the amount of glucose absorbed by the liver
insulin resistance partial blocking of the effect of insulin
intercostal muscles muscles between ribs
interferon biological response modifier that stimulates the growth of certain disases-fighting blood cells
intolerance allergy or sensitivity to a food or drug
intravenous line thin tube inserted into vein through which a volume of fluid is injected into the bloodstream.
invasive cancer cancer that begins in one area and spreads to another
ischemia decreased flow of oxygenated blood to an organ due to artery obstruction
isometric muscle contraction without movement at the joint
isthmus tissue that connects the two lobes of the thyroid




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