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

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attention deficit disorder a behavioral disorder, usually beginning in childhood, characterized by inability to focus one's attention, impulsive behaviors, and, often, hyperactivity; attention deficit hyperactivity disorder.
attention deficit hyperactivity disorder a behavioral disorder, usually beginning in childhood, characterized by inability to focus one's attention, impulsive behaviors, and, often, hyperactivity.
autism spectrum disorder any of a group of developmental disorders, including autism and Asperger's syndrome, marked by repetitive behavior and problems with communication and social interaction.
colony collapse disorder an event in which all or most of the worker bees of a hive disappear, leaving in the hive the queen,the immature bees, some adult bees to care for the immature bees, and the honey.
obsessive-compulsive disorder a mental disorder characterized by having unwanted and uncontrollable thoughts (obsessions), and/or engaging in repetitive and uncontrollable behaviors (compulsions); OCD.
persistent depressive disorder a condition of chronic mild depression or irritability that is often accompanied by other symptoms, including low self-esteem, eating or sleep disturbances, and fatigue. Formerly called dysthymia.