oat cell carcinoma
noun(oat-cell carcinoma)
cancer of a highly malignant form that affects the lungs, tends to metastasize to other parts of the body, and is characterized by small round or oval cells resembling oat grains and having a high ratio of nuclear protoplasm to cytoplasm —called also oat-cell cancer, oat-cell carcinoma, small-cell carcinoma, small-cell lung carcinoma