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[left]Disease:
1. A disorder of structure or function, especially one that produces specific clinical signs.
2. Any deviation from, or interruption of, the normal structure or function of any part, organ or system of the body; which may be clinical (characteristic set of symptoms and signs) or subclinical and whose etiology, pathology and prognosis may be known or unknown.
Etiology: The cause of disease; intrinsic (genetic) or extrinsic (eg infectious, chemical, physical, etc).
Biopsy: the removal and examination of tissue from the living body to establish a precise diagnosis.
Neoplasia = neo ("new") + plasia ("form") = the process of new grow
Neoplasm = the new growth; can be benign or malignant.
Oncology = oncos ("mass, bulk") + logos ("reason"); the study of neoplasia.
Tumor = tumere ("to swell"); historically referred to any swelling, now synonymous with neoplasm.
"A tumor is an abnormal mass of tissue, the growth of which exceeds and is uncoordinated with that of the normal tissue and persists in the same excessive manner after cessation of the stimuli which evoked the change.
Cancer
1- The common term for all malignant neoplasms (used more frequently in human medicine).
2- (medical term: malignant neoplasm) is a class of diseases in which a group of cells display uncontrolled growth , invasion , and sometimes metastasis.
3- Cancer is characterized by infiltrative, erosive growth that extends crab-like feet into adjacent tissues.
Pathology:
1- The study of disease; literally, the study (logos) of suffering (pathos).
2- The study of the functional, biochemical and morphological alterations in cells, tissues and organs that underlie disease.
3- The study and diagnosis of disease through examination of organs, tissues, body fluids and whole bodies (Autopsy).