from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A small congenital growth on the human skin, usually slightly raised and dark and sometimes hairy, especially a pigmented nevus.
  • n. Any of various small insectivorous mammals of the family Talpidae, usually living underground and having thickset bodies with light brown to dark gray silky fur, rudimentary eyes, tough muzzles, and strong forefeet for burrowing.
  • n. A machine that bores through hard surfaces, used especially for tunneling through rock.
  • n. A spy who operates from within an organization, especially a double agent operating against his or her own government from within its intelligence establishment.
  • n. A massive, usually stone wall constructed in the sea, used as a breakwater and built to enclose or protect an anchorage or a harbor.
  • n. The anchorage or harbor enclosed by a mole.
  • n. A fleshy abnormal mass formed in the uterus by the degeneration or abortive development of an ovum.
  • n. The amount of a substance that contains as many atoms, molecules, ions, or other elementary units as the number of atoms in 0.012 kilogram of carbon 12. The number is 6.0225 × 1023, or Avogadro's number. Also called gram molecule.
  • n. The mass in grams of this amount of a substance, numerically equal to the molecular weight of the substance. Also called gram-molecular weight. See Table at measurement.
  • n. Any of various spicy sauces of Mexican origin, usually having a base of onion, chilies, nuts or seeds, and unsweetened chocolate and served with meat or poultry.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A pigmented spot on the skin, a naevus, slightly raised, and sometimes hairy.
  • n. Any of several small, burrowing insectivores of the family Talpidae.
  • n. Any of the burrowing rodents also called mole rats.
  • n. An internal spy, a person who involves himself or herself with an enemy organisation, especially an intelligence or governmental organisation, to determine and betray its secrets from within.
  • n. A moll, a bitch, a slut.
  • n. A haven or harbour, protected with such a breakwater.
  • n. In the International System of Units, the base unit of amount of substance; the amount of substance of a system which contains as many elementary entities as there are atoms in 0.012 kg of carbon-12. Symbol: mol. The number of atoms is known as Avogadro’s number
  • n. A hemorrhagic mass of tissue in the uterus caused by a dead ovum.

from the GNU version of the Collaborative International Dictionary of English

  • n. A spot; a stain; a mark which discolors or disfigures.
  • n. A spot, mark, or small permanent protuberance on the human body; esp., a spot which is dark-colored, from which commonly issue one or more hairs.
  • n. A mass of fleshy or other more or less solid matter generated in the uterus.
  • n. A mound or massive work formed of masonry or large stones, etc., laid in the sea, often extended either in a right line or an arc of a circle before a port which it serves to defend from the violence of the waves, thus protecting ships in a harbor; also, sometimes, the harbor itself.
  • n. Any insectivore of the family Talpidæ. They have minute eyes and ears, soft fur, and very large and strong fore feet.
  • n. A plow of peculiar construction, for forming underground drains.
  • n. A spy who lives for years an apparently normal life (to establish a cover) before beginning his spying activities.
  • n. A quantity of a substance equal to the molecular weight of a substance expressed in grams; a gram molecule; the basic unit of amount of substance adopted under the System International d'Unites.
  • transitive v. To form holes in, as a mole; to burrow; to excavate.
  • transitive v. To clear of molehills.

from The Century Dictionary and Cyclopedia

  • To spot or stain.
  • To clear of molehills.
  • To burrow or form holes in, as a mole: as, to mole the earth.
  • To destroy moles.
  • To speak.
  • n. A spot; a stain, as on a garment.
  • n. Specifically
  • n. A small permanent abnormal spot on the surface of the human body, usually of a dark color and slightly elevated, and often hairy; a pigmentary nævus; also, a vascular nævus See nævus.
  • n. An insectivorous mammal of the family Talpidæ (which see for technical characters).
  • n. A kind of plow or other implement drawn or driven through the subsoil in making drains; a mole-plow.
  • n. The rodent bathyergue or mole-rat of South Africa, Bathyergus maritimus.
  • n. A mound or massive work, formed largely of stone, inclosing a harbor or anchorage, to protect it from the violence of the waves.
  • n. A form of ancient Roman mausoleum, consisting of a round tower on a square base, insulated, encompassed with columns, and covered with a dome.
  • n. A somewhat shapeless, compact fleshy mass occurring in the uterus, either due to the retention and continued life of the whole or a part of the fetal envelops after the death of the fetus (a maternal or true mole), or being some other body liable to be mistaken for this, as the membrane in membranous dysmenorrhea, or perhaps a polypus (a false mole).
  • n. Coarse meal mixed with salt, in ancient times used in sacrifices.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. the molecular weight of a substance expressed in grams; the basic unit of amount of substance adopted under the Systeme International d'Unites
  • n. spicy sauce often containing chocolate
  • n. a small congenital pigmented spot on the skin
  • n. a spy who works against enemy espionage
  • n. a protective structure of stone or concrete; extends from shore into the water to prevent a beach from washing away
  • n. small velvety-furred burrowing mammal having small eyes and fossorial forefeet


from The American Heritage® Dictionary of the English Language, 4th Edition

Middle English, from Old English māl.
Middle English molle; possibly akin to mold3.
French môle, from Italian molo, from Late Greek mōlos, from Latin mōlēs, mass, mole.
French môle, from Latin mola, millstone, mole; .
German Mol, short for Molekulargewicht, molecular weight, from molekular, molecular, from French moléculaire, from molécule, molecule; see molecule.
American Spanish, from Nahuatl mōlli.

from Wiktionary, Creative Commons Attribution/Share-Alike License

From moll (from Moll, an archaic nickname for Mary), influenced by the spelling of the word mole ("an internal spy"), and due to /mɒl/ and /məʊl/ merging as [moʊl] in the Australian accent.



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  • Oh, that reminds me - what do chemists use to make guacamole? The Avocado constant. (See avogadro's number.)

    August 19, 2010

  • Wikipedia tells us that mole sauce is from "(Mexican Spanish, from Nahuatl mulli or molli, 'sauce' or 'concoction')" and is "the generic name for several sauces used in Mexican cuisine, as well as for dishes based on these sauces. Outside of Mexico, it often refers to a specific sauce which is known in Spanish by the more specific name mole poblano. The word is also widely known in the combined form guacamole (avocado concoction). In contemporary Mexico, the term is used for a number of sauces, some quite dissimilar to one another, including black, red, yellow, colorado, green, almendrado, and pipián."

    I do sometimes have to tell grocery clerks that it doesn't have any moles in it.

    August 19, 2010

  • 2 small, dark brown mark on skin

    May 16, 2009

  • spy equivalent in value to 007 secret agents, or 25 cagey bees

    November 7, 2007

  • He lifted his feet up from the suck and turned back by the mole of boulders.

    Joyce, Ulysses, 3

    December 30, 2006