tumor

A tumor is a growth — a mass of tissue — that has no function. Tumors can be harmless (benign) or harmful (malignant), but they are never any fun.

When a bunch of cells form a new growth in or on an animal, and those cells have no purpose, the result is a tumor. The word tumor comes directly from Latin word for “swelling.” Tumors can be big or small, harmless or harmful. Benign tumors are not a cause for concern, but a malignant tumor is serious and could be cancerous. A doctor must test a tumor to see which kind it is.

Definitions of tumor
  1. noun
    an abnormal new mass of tissue that serves no purpose
    synonyms: neoplasm, tumour
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    types:
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    acanthoma, skin tumor
    a neoplasm originating in the epidermis
    angioma
    a tumor consisting of a mass of blood or lymphatic vessels
    benign tumor, benign tumour, nonmalignant neoplasm, nonmalignant tumor, nonmalignant tumour
    a tumor that is not cancerous
    blastocytoma, blastoma, embryonal carcinosarcoma
    a tumor composed of immature undifferentiated cells
    brain tumor, brain tumour
    a tumor in the brain
    carcinoid
    a small tumor (benign or malignant) arising from the mucosa of the gastrointestinal tract; usually associated with excessive secretion of serotonin
    celioma
    an abdominal tumor
    granuloma
    a tumor composed of granulation tissue resulting from injury or inflammation or infection
    adipose tumor, lipoma
    a tumor consisting of fatty tissue
    malignant neoplasm, malignant tumor, metastatic tumor
    a tumor that is malignant and tends to spread to other parts of the body
    meningioma
    a tumor arising in the meninges which surround the brain and spinal cord; usually slow growing and sometimes malignant
    neurilemoma, neurofibroma
    tumor of the fibrous covering of a peripheral nerve
    neuroma
    any tumor derived from cells of the nervous system
    phaeochromocytoma, pheochromocytoma
    a vascular tumor of the adrenal gland; hypersecretion of epinephrine results in intermittent or sustained hypertension
    pinealoma
    tumor of the pineal gland
    plasmacytoma
    neoplasm of plasma cells (usually in bone marrow)
    psammoma, sand tumor
    a tumor derived from fibrous tissue of the meninges or choroid plexus or certain other structures associated with the brain; characterized by sandlike particles
    teratoma
    a tumor consisting of a mixture of tissues not normally found at that site
    adenoma
    a benign epithelial tumor of glandular origin
    chondroma
    a common benign tumor of cartilage cells
    glioblastoma, spongioblastoma
    a fast-growing malignant brain tumor composed of spongioblasts; nearly always fatal
    glioma
    a tumor of the brain consisting of neuroglia
    carcinosarcoma
    a malignant neoplasm composed of carcinoma and sarcoma extensively intermixed
    enchondroma
    benign slow-growing tumor of cartilaginous cells at the ends of tubular bones (especially in the hands and feet)
    fibroma
    nonmalignant tumor of connective tissue
    gumma
    a small rubbery granuloma that is characteristic of an advanced stage of syphilis
    keratoacanthoma
    skin tumor that grows rapidly (especially in older people) and resembles a carcinoma but does not spread; it usually disappears spontaneously, often leaving a scar
    cancer, malignant neoplastic disease
    any malignant growth or tumor caused by abnormal and uncontrolled cell division; it may spread to other parts of the body through the lymphatic system or the blood stream
    angiosarcoma
    a rare malignant neoplasm arising from vascular tissue; usually occurs in the breast and skin and is believed to originate from the endothelial cells of blood vessels
    haemangioma, hemangioma
    benign angioma consisting of a mass of blood vessels; some appear as birthmarks
    lymphangioma
    benign angioma consisting of a mass of lymphatic vessels
    spider angioma, spider nevus, vascular spider
    a dilation of superficial capillaries with a central red dot from which blood vessels radiate
    myeloma
    a tumor of the bone marrow (usually malignant) composed of cells normally found in bone marrow
    myoma
    a benign tumor composed of muscle tissue
    myxoma
    a benign tumor of connective tissue containing jellylike material
    neurinoma
    tumor (usually benign) of the sheath surrounding a nerve
    neuroblastoma
    malignant tumor containing embryonic nerve cells; usually metastasizes quickly
    neuroepithelioma
    malignant tumor of the neuroepithelium
    osteoblastoma
    benign tumor of bone and fibrous tissue; occurs in the vertebrae or femur or tibia or arm bones (especially in young adults)
    osteochondroma
    benign tumor containing both bone and cartilage; usually occurs near the end of a long bone
    osteoma
    a slow growing benign tumor of consisting of bone tissue; usually on the skull or mandible
    papillary tumor, papillary tumour, papilloma, villoma
    a benign epithelial tumor forming a rounded mass
    retinoblastoma
    malignant ocular tumor of retinal cells; usually occurs before the third year of life; composed of primitive small round retinal cells
    type of:
    growth
    (pathology) an abnormal proliferation of tissue (as in a tumor)
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