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

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acquired immune deficiency syndrome see AIDS.
Asperger's syndrome a mild autism spectrum disorder in which afflicted individuals are generally of normal intelligence but have poor social and nonverbal communication skills.
carpal tunnel syndrome a pathological condition of pressure on the median nerve of the wrist and hand, usu. resulting in pain, numbness, and muscular weakening.
Down's syndrome a congenital condition caused by an abnormal number of chromosomes which results in mental retardation and produces distinctive physical characteristics such as a broad face, flattened head, and slanted eyes.
Klinefelter's syndrome a congenital disorder that causes sterility in males, caused by an extra X chromosome.
premenstrual syndrome a complex of symptoms that may occur before the onset of menstrual flow, including depression, irritability, fluid retention, and breast soreness.
Reye's syndrome a rare, acute, often fatal disease that chiefly affects children, usu. follows a viral disease, and is characterized by fever, vomiting, enlargement of the brain and liver, and neurological disorders.
Severe Acute Respiratory Syndrome an atypical pneumonia that has a mortality rate of approximately 10 percent, often referred to by its acronym "SARS." A major outbreak occurred in 2003.
sudden infant death syndrome the unexpected death of a seemingly healthy infant, usu. occurring within the first year of life, and usu. occurring in the infant's sleep; crib death.
toxic-shock syndrome a sometimes fatal disease, esp. contracted by young women during menstruation, characterized by fever, vomiting, and diarrhea, and thought to be connected with the use of certain tampons that cause a rapid spread of bacterial infection in the vagina.