Attentional: Relating to attention. The term is used in psychology and child development as, for example, early television exposure has been found to be associated with attentional problems at age 7.

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    Attenuated: Weakened, diluted, thinned, reduced, weakened, diminished. The use of “attenuated” in medicine is not new. In the 16th century, eating dried figs was claimed to attenuate the body fluids. Now “attenuated” refers to procedures that weaken an agent of disease (a pathogen). An attenuated virus is a weakened, less vigorous virus. A vaccine against […]

  • Attenuated familial adenomatous polyposis

    Attenuated familial adenomatous polyposis: An inherited predisposition to colorectal cancer characterized by fewer than 100 adenomatous polyps in the colon and rectum. It is said to be attenuated because there are fewer polyps than in classic familial adenomatous polyposis (FAP). People with attenuated familial adenomatous polyposis (AFAP) also tend to be older at the diagnosis […]

  • Attenuated virus

    Attenuated virus: A weakened, less vigorous virus. An attenuated virus may be used to make a vaccine that is capable of stimulating an immune response and creating immunity, but not of causing illness.

  • Atypical measles syndrome (AMS)

    Atypical measles syndrome (AMS): An altered expression of measles, AMS begins suddenly with high fever, headache, cough, and abdominal pain. The rash may appear 1 to 2 days later, often beginning on the limbs. Swelling (edema) of the hands and feet may occur. Pneumonia is common and may persist for 3 months or more. AMS […]

  • Ataxia

    Poor coordination and unsteadiness due to the brain’s failure to regulate the body’s posture and regulate the strength and direction of limb movements. Ataxia is usually due to disease in the cerebellum of the brain, which lies beneath the back part of the cerebrum.

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