mole

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A massive, usually stone wall constructed in the sea, used as a breakwater and built to enclose or protect an anchorage or a harbor.
• noun The anchorage or harbor enclosed by a mole.
• noun Any of various small insectivorous mammals of the family Talpidae of North America and Eurasia, usually living underground and having a thickset body with light brown to dark gray silky fur, strong forefeet for burrowing, and often rudimentary eyes.
• noun A machine that bores through hard surfaces, used especially for tunneling through rock.
• noun A spy who operates from within an organization, especially a double agent operating against his or her own government from within its intelligence establishment.
• noun In the International System, the base unit used in representing an amount of a substance, equal to the amount of that 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 6.0221 × 10²³, or Avogadro's number.
• noun A skin lesion, commonly a nevus, that is typically raised and discolored.
• noun A fleshy abnormal mass formed in the uterus by the degeneration or abortive development of an ovum.

from The Century Dictionary.

• To spot or stain.
• noun A spot; a stain, as on a garment.
• noun Specifically
• noun 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.
• To clear of molehills.
• To burrow or form holes in, as a mole: as, to mole the earth.
• To destroy moles.
• noun A mound or massive work, formed largely of stone, inclosing a harbor or anchorage, to protect it from the violence of the waves.
• noun A form of ancient Roman mausoleum, consisting of a round tower on a square base, insulated, encompassed with columns, and covered with a dome.
• noun An insectivorous mammal of the family Talpidæ (which see for technical characters).
• noun A kind of plow or other implement drawn or driven through the subsoil in making drains; a mole-plow.
• noun The rodent bathyergue or mole-rat of South Africa, Bathyergus maritimus.
• noun 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).
• To speak.
• noun Coarse meal mixed with salt, in ancient times used in sacrifices.

from the GNU version of the Collaborative International Dictionary of English.

• noun A mass of fleshy or other more or less solid matter generated in the uterus.
• noun obsolete A spot; a stain; a mark which discolors or disfigures.
• noun 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.
• noun 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.
• noun 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 verb To form holes in, as a mole; to burrow; to excavate.
• transitive verb Prov. Eng. To clear of molehills.
• noun (Zoöl.) Any insectivore of the family Talpidæ. They have minute eyes and ears, soft fur, and very large and strong fore feet.
• noun U.S. A plow of peculiar construction, for forming underground drains.
• noun A spy who lives for years an apparently normal life (to establish a cover) before beginning his spying activities.
• noun See under Duck.
• noun See Chrysochlore.
• noun (Zoöl.) an orthopterous insect of the genus Gryllotalpa, which excavates subterranean galleries, and throws up mounds of earth resembling those of the mole. It is said to do damage by injuring the roots of plants. The common European species (Gryllotalpa vulgaris), and the American (Gryllotalpa borealis), are the best known.
• noun (Zoöl.) any one of several species of Old World rodents of the genera Spalax, Georychus, and several allied genera. They are molelike in appearance and habits, and their eyes are small or rudimentary.
• noun (Zoöl.) any one of several species of short-tailed American shrews of the genus Blarina, esp. Blarina brevicauda.
• noun the duck mole.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A moll, a bitch, a slut.
• noun A pigmented spot on the skin, a naevus, slightly raised, and sometimes hairy.
• noun rare A haven or harbour, protected with such a breakwater.
• noun Any of several small, burrowing insectivores of the family Talpidae.
• noun Any of the burrowing rodents also called mole rats.
• noun espionage 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.
• noun chemistry, physics 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
• noun A hemorrhagic mass of tissue in the uterus caused by a dead ovum.

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

• noun the molecular weight of a substance expressed in grams; the basic unit of amount of substance adopted under the Systeme International d'Unites
• noun spicy sauce often containing chocolate
• noun a small congenital pigmented spot on the skin