> definitions of data.frames vs. matrix vs vectors. I have read many R. > tutorials, and looked over ump-teen 'cheat' sheets and have found that. > no one has articulated a really good definition of the differences. > between 'data.frames', 'matrix', and 'arrays' and even 'factors'.
Medical Definition of Tumor Our Tumor (Grade) Main Article provides a comprehensive look at the who, what, when and how of Tumor (Grade) Tumor: An abnormal mass of tissue. Tumors are a classic sign of inflammation, and can be benign or malignant (cancerous). There are dozens of different types of tumors. Their names usually reflect the kind of tissue they arise in, and may also tell you something about their shape or how they grow.
neoplasm, n (tumor), an abnormal mass of tissue, the growth of which exceeds and is uncoordinated with that of the normal tissues. It persists in the same excessive manner after cessation of the stimuli that evoked the change.Benign and malignant forms are recognized.See also neoplasia and tumor.eoplastic, adj. (1) An abnormal mass of tissue, the growth of which exceeds and is uncoordinated with that of normal tissue, and persists in the same excessive manner after cessation of the stimuli evoking the change. (2) Any autonomous proliferation of cells, benign or malignant. Neoplasm classifications.