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Term Definition
abdominal bloating

swollen stomach; also known as distention

absence seizures

stopping activity and staring into space for a few seconds


surgery that removes the adenoids in an attempt to reduce frequent sinus and ear infections

ankyloglossia (tongue tied)

the improper positioning of tongue tissue in the mouth, which restricts the tongue's free movement.

antibody titers

laboratory test that measures the presence and amount of antibodies in blood; antibodies are produced when a vaccine is successful

anxiety disorder

excessive anxiety and worry about a number of events or activities.


abnormal heart rhythm


respiratory disorder, often of allergic origin, characterized by difficulty breathing, wheezing, and a sense of constriction in the chest


condition in which the curvature of the cornea

Ativan (lorazepam)

a benzodiazepine used to treat anxiety disorders or anxiety associated with depression

atonic seizures

minor seizure characterized by a brief lapse in muscle tone

atypical absence seizures

common chronic neurological disorder

augmentative communication

communication method using a representation system or symbols, including gestures, hand signals, photographs, pictures, line drawings, words and letters, which can be used alone or in combination


a developmental disorder that appears in the first 3 years of life; affects the brain's normal development of social and communication skills

autistic entercolitis

controversial term first used by British gastroenterologist Andrew Wakefield to describe a number of common clinical symptoms and signs which he contends are distinctive to autism