Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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internal bleeding bleeding on the inside of the body, often caused by injuries.
internal medicine a specialized medical practice that deals with the diagnosis and nonsurgical treatment of disease, esp. of internal organs and tissues.
internal revenue government revenue that is derived from domestic sources, such as taxes on income, profits, luxuries, and amusements.
Internal Revenue Service the U.S. government agency responsible for administering and enforcing federal tax laws and collecting federal taxes. (abbr.: IRS)
internal-combustion engine an engine, esp. an automobile engine, that is powered by the heat and pressure produced by the burning of a mixture of fuel and air in a cylinder or cylinders.