nodule

/noj"oohl/, n.
1. a small node, knot, or knob.
2. a small, rounded mass or lump.
3. Bot. a tubercle.
[1590-1600; < L nodulus a little knot, equiv. to nod(us) NODE + -ulus -ULE]

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In geology, a rounded mineral concretion that is distinct from, and may be separated from, the formation in which it occurs.

Nodules usually are elongated and have a knobby irregular surface; they are generally oriented parallel to the bedding. Chert and flint, clay ironstone, and phosphorites commonly occur as nodules. Manganese-rich nodules are found on the ocean floor.

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      rounded mineral concretion that is distinct from, and may be separated from, the formation in which it occurs. Nodules commonly are elongate with a knobby irregular surface; they usually are oriented parallel to the bedding.

      Chert (chert and flint) and flint often occur as dense and structureless nodules of nearly pure silica in limestone or chalk, where they seem to be replacements of the carbonate rock by silica. Clay ironstone, a mixture of clay and siderite (iron carbonate), sometimes occurs as layers of dark-gray to brown, fine-grained nodules overlying coal seams. Phosphorites (phosphorite), massive phosphate rocks, often occur in phosphate deposits, in some limestones and chalks, and on the present sea bottom as black, fine-grained, and dense nodules with an elliptical shape and no structure.

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Universalium. 2010.

Look at other dictionaries:

  • nodule — [ nɔdyl ] n. m. • 1498; lat. nodulus « petit nœud » 1 ♦ Pathol. Petite nodosité. Nodule cancéreux, tuberculeux. ⇒ tubercule. Anat. Petit renflement. Nodules des valvules aortiques du cœur. 2 ♦ (1795 ) Géol. Concrétion pierreuse qui se rencontre… …   Encyclopédie Universelle

  • Nodule — may refer to: Nodule (geology), a small knobbly rock or mineral cluster, such as a manganese nodule Nodule (medicine), a small aggregation of cells Nodule (dermatology), a lesion similar to a papule Root nodule, an outgrowth formed on the roots… …   Wikipedia

  • Nodule — Nod ule (n[o^]d [ u]l), n. [L. nodulus, dim. of nodus knot: cf. F. nodule.] A rounded mass or irregular shape; a little knot or lump. [1913 Webster] …   The Collaborative International Dictionary of English

  • nodule — (n.) early 15c., from L. nodulus small knot, dim. of nodus knot (see NET (Cf. net) (n.)). Related: Nodulated; nodulous; nodulation …   Etymology dictionary

  • nodule — nȍdule ž mn DEFINICIJA min. mineralna tijela izgrađena od submikroskopski sitnih zrna kvarca ili kalcedona i rožnjaka ETIMOLOGIJA lat. nodulus: čvorić …   Hrvatski jezični portal

  • nodule — ► NOUN 1) a small swelling or aggregation of cells in the body. 2) a swelling on a root of a leguminous plant, containing nitrogen fixing bacteria. 3) a small rounded lump of matter distinct from its surroundings. DERIVATIVES nodular adjective.… …   English terms dictionary

  • nodule — [näj′o͞ol] n. [L nodulus, dim. of nodus, a knot: see NET1] 1. a small knot or irregular, rounded lump 2. Anat. a small node 3. Bot. a small knot or joint on a stem or root, esp. one containing nitrogen fixing bacteria 4. Geol …   English World dictionary

  • Nodule — Cette page d’homonymie répertorie les différents sujets et articles partageant un même nom. Emprunté au latin nodulus signifiant « petit nœud », un nodule désigne à l origine un petit renflement ; ce mot a plusieurs… …   Wikipédia en Français

  • Nodule — A small solid collection of tissue, a nodule is palpable (can be felt). It may range in size from greater than 1.0 cm (3/8 inch) to somewhat less than 2 cm (13/16 inch) in diameter. A nodule may be present in the epidermis, dermis or subcutis (at …   Medical dictionary

  • nodule — [[t]nɒ̱djuːl, AM ʤuːl[/t]] nodules 1) N COUNT A nodule is a small round lump that can appear on your body and is a sign of an illness. [MEDICAL] In a typical case, there is a small inflamed nodule just under the skin. 2) N COUNT: oft n N A nodule …   English dictionary

  • nodule — UK [ˈnɒdjuːl] / US [ˈnɑˌdʒul] noun [countable] Word forms nodule : singular nodule plural nodules medical a small round lump in your body formed from cells or tissue …   English dictionary

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