Document kDpb9ZQ8m2QJaprVdrVOvEZND

IV GLOSSARY For the purpose of clarity and uniformity, the terras used is this report are herewith defined according to the manner of their use. Asbestos workers: Workers exposed to asbestos dust in other than raining operations. Asbestos miners: Workers engaged in the raining and prepara tion of asbestos in the areas under srudy. Asbestosis: A generalized fibrosis of the lungs diagnosable by x-ray, or by microscopic examina tion of the lung tissue, but not necessarily accompanied by symptoms or by disability. Cohort: A segment of the population, defined accord ing to certain criteria, and representative of the whole population. Specifically in this study, a group of asbestos miners having at least five years of exposure in the industry add who were in the industry during 1950. Lung cancer, cancer of the lung: A neoplasm of the lung or bronchus, wher ever situated, and including adenocarcinoma, .squamous cell, and undiiferentiated, round, or "oat cell" histological types. Primary cancer of the lung means sucb a neoplasm originating la tbo lung, ana not secondarily in the lung as the result of a metastasis from another primary location in the -tody. Smoker: As used la this presentation, the term smoker refers to a cigarette smoker, h-bitually smok ing more iban five cigarettes per day. Persons who smoke pipes or cigars exclusively were not-considered to be smokers for the purpose of this study.