mole

1
[ mohl ]
/ moʊl /

noun

any of various small insectivorous mammals, especially of the family Talpidae, living chiefly underground, and having velvety fur, very small eyes, and strong forefeet.
a spy who becomes part of and works from within the ranks of an enemy governmental staff or intelligence agency.Compare double agent.
Machinery. a large, powerful machine for boring through earth or rock, used in the construction of tunnels.

Origin of mole

1
1350–1400; Middle English molle; akin to Middle Dutch, Middle Low German mol

Definition for mole (2 of 6)

mole

2
[ mohl ]
/ moʊl /

noun

a small, congenital spot or blemish on the human skin, usually of a dark color, slightly elevated, and sometimes hairy; nevus.

Origin of mole

2
before 1000; Middle English; Old English māl; cognate with Old High German meil spot, Gothic mail wrinkle

Definition for mole (3 of 6)

mole

3
[ mohl ]
/ moʊl /

noun

a massive structure, especially of stone, set up in the water, as for a breakwater or a pier.
an anchorage or harbor protected by such a structure.

Origin of mole

3
First recorded in 1540–50, mole is from the Latin word mōlēs mass, dam, mole

Definition for mole (4 of 6)

mole

4

or mol

[ mohl ]
/ moʊl /

noun Chemistry.

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).

Origin of mole

4
1900–05; < German Mol, short for Molekül molecule

Definition for mole (5 of 6)

mole

5
[ mohl ]
/ moʊl /

noun Pathology.

a fleshy mass in the uterus formed by a hemorrhagic dead ovum.

Origin of mole

5
1605–15; < New Latin mola, special use of mola millstone

Definition for mole (6 of 6)

mole

6
[ moh-ley; Spanish maw-le ]
/ ˈmoʊ leɪ; Spanish ˈmɔ lɛ /

noun Mexican Cookery.

a spicy sauce flavored with chocolate, usually served with turkey or chicken.

Origin of mole

6
1925–30; < Mexican Spanish < Nahuatl mōlli sauce; cf. guacamole
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for mole

British Dictionary definitions for mole (1 of 6)

mole

1
/ (məʊl) /

noun

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
golden mole any small African burrowing molelike mammal of the family Chrysochloridae, having copper-coloured fur: order Insectivora (insectivores)
informal a spy who has infiltrated an organization and, often over a long period, become a trusted member of it

Word Origin for mole

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

British Dictionary definitions for mole (2 of 6)

mole

2
/ (məʊl) /

noun

a breakwater
a harbour protected by a breakwater
a large tunnel excavator for use in soft rock

Word Origin for mole

C16: from French môle, from Latin mōlēs mass

British Dictionary definitions for mole (3 of 6)

mole

3
/ (məʊl) /

noun

pathol a nontechnical name for naevus

Word Origin for mole

Old English māl; related to Old High German meil spot

British Dictionary definitions for mole (4 of 6)

mole

4
/ (məʊl) /

noun

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

Word Origin for mole

C20: from German Mol, short for Molekül molecule

British Dictionary definitions for mole (5 of 6)

mole

5
/ (məʊl) /

noun

pathol a fleshy growth in the uterus formed by the degeneration of fetal tissues

Word Origin for mole

C17: medical use of Latin mola millstone

British Dictionary definitions for mole (6 of 6)

mole

6
/ (ˈməʊleɪ) /

noun

a spicy Mexican sauce made from chili and chocolate

Word Origin for mole

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

Science definitions for mole (1 of 2)

mole

1
[ mōl ]

A small, usually pigmented, benign growth on the skin.

Science definitions for mole (2 of 2)

mole

2
[ mōl ]

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.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.