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mol

[mohl]
noun Chemistry.
  1. mole4.
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mole4

or mol

[mohl]
noun Chemistry.
  1. the basic unit in the International System of Units(SI), representing the amount of a substance expressed in grams containing as many atoms, molecules, or ions as the number of atoms in 12 grams of carbon-12 (which is Avogadro's number, or 6.022 × 1023).
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Origin of mole4

1900–05; < German Mol, short for Molekül molecule

mol.

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for mol

mol

the chemical symbol for
  1. mole³
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mol.

abbreviation for
  1. molecular
  2. molecule
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mole1

noun
  1. any small burrowing mammal, of the family Talpidae, of Europe, Asia, and North and Central America: order Insectivora (insectivores). They have velvety, typically dark fur and forearms specialized for digging
  2. golden mole any small African burrowing molelike mammal of the family Chrysochloridae, having copper-coloured fur: order Insectivora (insectivores)
  3. informal a spy who has infiltrated an organization and, often over a long period, become a trusted member of it
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Word Origin

C14: from Middle Dutch mol, of Germanic origin; compare Middle Low German mol

mole2

noun
  1. a breakwater
  2. a harbour protected by a breakwater
  3. a large tunnel excavator for use in soft rock
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Word Origin

C16: from French môle, from Latin mōlēs mass

mole3

noun
  1. pathol a nontechnical name for naevus
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Word Origin

Old English māl; related to Old High German meil spot

mole4

noun
  1. the basic SI unit of amount of substance; the amount that contains as many elementary entities as there are atoms in 0.012 kilogram of carbon-12. The entity must be specified and may be an atom, a molecule, an ion, a radical, an electron, a photon, etcSymbol: mol
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Word Origin

C20: from German Mol, short for Molekül molecule

mole5

noun
  1. pathol a fleshy growth in the uterus formed by the degeneration of fetal tissues
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Word Origin

C17: medical use of Latin mola millstone

mole6

noun
  1. a spicy Mexican sauce made from chili and chocolate
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Word Origin

C20: from Mexican Spanish from Nahuatl molli sauce
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for mol

mole

n.1

spot on skin, Old English mal "spot, mark, blemish," especially on cloth or linen, from Proto-Germanic *mailan "spot, mark" (cf. Old High German meil, German Mal, Gothic mail "wrinkle"), from PIE root *mai- "to stain, defile" (cf. Greek miainein "to stain, defile," see miasma). Specifically of dark marks on human skin from late 14c.

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mole

n.2

type of small burrowing mammal (Talpa europea), mid-14c., probably from obsolete moldwarp, literally "earth-thrower." Spy sense first recorded 1974 in John le Carré (but suggested from early 20c.), from notion of "burrowing." Metaphoric use for "one who works in darkness" is from c.1600.

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mole

n.3

"breakwater," 1540s, from Middle French môle "breakwater" (16c.), ultimately from Latin moles "mass, massive structure, barrier," from PIE root *mo- "to exert oneself" (cf. Greek molos "effort," molis "hardly, scarcely;" German mühen "to tire," müde "weary, tired;" Russian majat' "to fatigue, exhaust," maja "hard work").

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mole

n.4

unit of molecular quantity, 1902, from German Mol coined 1900 by German chemist Wilhelm Ostwald (1853-1912), short for Molekül (see molecule).

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Online Etymology Dictionary, © 2010 Douglas Harper

mol in Medicine

mol

(mōl)
n.
  1. Variant ofmole3
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

mol in Science

mole1

[mōl]
  1. A small, usually pigmented, benign growth on the skin.
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mole2

[mōl]
  1. The amount of an element, compound, or other substance that has the same number of basic particles as 12 grams of Carbon-12. The number of particles making up a mole is Avogadro's number. For elements and compounds, the mass of one mole, in grams, is roughly equal to the atomic or molecular weight of the substance. For example, carbon dioxide, CO2, has a molecular weight of 44; therefore, one mole of it weighs 44 grams.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.