chemical engineering: the branch of engineering that is concerned with the design and construction and operation of the plants and machinery used in industrial chemical processes
abstraction: a general concept formed by extracting common features from specific examples
alzheimer's disease: a progressive form of presenile dementia that is similar to senile dementia except that it usually starts in the 40s or 50s; first symptoms are impaired memory which is followed by impaired thought and speech and finally complete helplessness