1. (of people or animals, things or actions) apt or ready to attack; offensive
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2. a condition where a sense or function is harmed so that it does not work properly
3. scientific study of the structure, function, and diseases of the nervous system.
4. a collection of records or documents
5. a disease of the brain that affects especially old people and results in the gradual loss of memory, speech, movement, and the ability to think clearly