Definition of nodule in English:

nodule

noun

  • 1A small swelling or aggregation of cells in the body, especially an abnormal one.

    ‘the area feels firm but has irregular nodules which can be painful to touch’
    ‘laparotomy showed white nodules in the liver’
    • ‘The subcutaneous nodule, 1.7 cm across, was excised under local anaesthetic.’
    • ‘Rashes with purpura, urticaria, and subcutaneous nodules are common.’
    • ‘The clinical significance of these small nodules of Langerhans cells is not fully understood.’
    • ‘A computed tomography scan showed multiple nodules in the liver and bilateral pulmonary metastasis.’
    • ‘She already had hepatic involvement, and the subcutaneous nodules spread over the whole of her trunk.’
    • ‘A thyroid nodule is a palpable swelling in a thyroid gland with an otherwise normal appearance.’
    • ‘Except for her purulent, multifocal, subcutaneous nodules, she was generally in good health.’
    • ‘It tends to appear as a papule or nodule with an epithelialized, pearly appearance, but may ulcerate in some cases.’
    • ‘Her wrist and knee were warm, red, swollen, and tender, but she had no rashes or subcutaneous nodules.’
    • ‘Computed tomography showed a solitary nodule in the right lobe of the liver.’
    • ‘Metastases from cutaneous melanoma normally present as flesh coloured papules or nodules in the skin.’
    • ‘These papules or nodules develop in areas that the patient can reach.’
    • ‘This produces a deeper infection, in the form of pustules and nodules.’
    • ‘The most common presenting lesions are papules, vesicles, pustules, and nodules.’
    • ‘Ultrasound techniques classify nodules as solid or cystic in the belief that solid lesions might be malignant and cystic lesions benign.’
    • ‘The most severe form of leprosy produces large disfiguring nodules, or lumps.’
    • ‘Leprosy is associated with symmetric skin lesions, nodules, plaques, and a thickened dermis.’
    • ‘This is seen in longstanding sarcoidosis, in which asymptomatic, violaceous nodules are seen on nose, fingers, and ears.’
    • ‘Regional adenopathy, satellite lesions, and subcutaneous nodules can be present.’
    • ‘Endoscopy evaluation revealed an antral nodule, which was biopsied.’
    • ‘The most common presentation for thyroid or salivary gland cancer is an asymptomatic nodule within the gland.’
    growth, lump, swelling, protuberance, protrusion, knob, nodule, outgrowth
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    1. 1.1A swelling on a root of a leguminous plant, containing nitrogen-fixing bacteria.
      • ‘Rhizobial bacteria generally enter roots of legumes via root-hairs and induce the formation of root nodules.’
      • ‘In return, the plant shelters and nourishes the bacterium inside root nodules, where nitrogen fixation occurs.’
      • ‘This interaction culminates in the formation of root nodules and in the differentiation of bacteria into bacteroids, which are capable of reducing atmospheric nitrogen into ammonia.’
      • ‘Nitrogen-fixing bacteria in the root nodules of leguminous plants (such as peas and clover) take in nitrogen direct from the air and pass it on to the plant, both feeding the plant and enriching the soil.’
      • ‘From this point on, the bacteria and the plant - members of two separate kingdoms - share the know-how and labor needed to construct what is essentially a new organ: a fully operational nitrogen-fixing root nodule.’
  • 2A small rounded lump of matter distinct from its surroundings, e.g. of flint in chalk, carbon in cast iron, or a mineral on the seabed.

    ‘flint nodules’
    ‘in the coal pits nodules of iron ore were mined’
    • ‘The most highly prized datolites have concentrated copper inclusions near the center of the nodule and are pinkish-gray in color.’
    • ‘The most persistent bed of nodules is found in the Late Devonian Huron Shale.’
    • ‘Individual nodules range from a fraction of an inch to more than 14 inches across.’
    • ‘Many of the nodules contain copper inclusions and, rarely, silver inclusions.’
    • ‘Many of the early datolite nodules recovered were dark purple with a distinctive black rind.’
    • ‘Turquoise here was found as vein fillings and nodules in weathered Precambrian granite.’
    • ‘The sediment was cemented with iron carbonate to form a hard nodule distinct from the shale around it.’
    • ‘Historically, similar nodules were collected from the upper levels of the Centennial mine.’
    • ‘Others contain cores of malachite that constitute up to about 30 percent of the nodule.’
    • ‘The minute copper particles are concentrated in bands or zones in the center of the nodules as well as near the edges.’
    • ‘On a second trip to the same area, additional nodules were recovered that exhibited the same dull colors.’
    • ‘In recent years more of these nodules have been collected from the mine dump and a drift in the mine.’
    • ‘Once dry, the individual nodules are immersed in water, causing much of the clay to fall away.’
    • ‘This type of digging yielded hundreds of nodules for area collectors and rock shops.’
    • ‘In these steep underwater cliff areas were chimneys of gravel that contained datolite nodules.’
    • ‘Crystals of brown sphalerite are found in fractures and on the surfaces of some chert nodules.’
    • ‘It has been estimated by some collectors that tons of the nodules were recovered from this dump.’
    • ‘A few people still poke around what is left of the mine dumps, but a datolite nodule is rarely found.’
    • ‘It is more visible when there are beds rich in clays, shell layers, or flints nodules.’
    • ‘Pyritic nodules, up to 1 cm in diameter, with internal radial structure, are abundant in the claystones.’
    lump, bump, protuberance, projection, protrusion, bulge, swelling, knot, node, nodule, gnarl, growth, outgrowth, excrescence, carbuncle, tumour
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Origin

Late Middle English: from Latin nodulus, diminutive of nodus knot.

Pronunciation:

nodule

/ˈnɒdjuːl/