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

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decompression sickness a painful and sometimes fatal condition caused by the formation of nitrogen bubbles in the blood, resulting from returning to atmospheric pressure too quickly from deep water or a compression chamber; aeroembolism; bends.
falling sickness see epilepsy.
morning sickness nausea and sometimes vomiting in the early part of the day during the first several months of pregnancy.
motion sickness nausea and dizziness induced by the motion of an airplane, car, ship, or the like.
mountain sickness nausea, weakness, and difficulty in breathing at high altitudes, caused by lack of oxygen.
radiation sickness sickness induced by overexposure to ionizing radiation such as x-rays or gamma rays, resulting in nausea, diarrhea, bleeding, hair loss, sterility, and often death.
sleeping sickness a usu. fatal infectious disease found in tropical Africa, characterized by fever, weakness, and tremors, and transmitted by tsetse flies. [2 definitions]