any of various small insectivorous mammals, especially of the family Talpidae, living chiefly underground, and having velvety fur, very small eyes, and strong forefeet: I stopped hating the moles in my rose garden when I realized they were eating the Japanese beetle grubs.
a spy who becomes part of and works from within the ranks of an enemy governmental staff or intelligence agency: There is always a risk that the mole may defect to the enemy.: Compare double agent.
Machinery. a large, powerful machine for boring through earth or rock, used in the construction of tunnels: He worked as a mechanic on the mole that created our subway tunnels.
Other definitions for mole (2 of 6)
a small, congenital spot or blemish on the human skin, usually of a dark color, slightly elevated, and sometimes hairy; nevus: The pamphlet explains why it's important to monitor changes in a mole's color or shape.
Other definitions for mole (3 of 6)
a massive structure, especially of stone, set up in the water, as for a breakwater, pier, or causeway: a mole may be topped with pierlike wooden planking, but unlike a typical pier, the mole does not allow water to pass under it: Islanders are raising money to restore the mole that once ran to the mainland.
an anchorage or harbor protected by such a structure: For our small fleet of boats, this mole has been most accommodating.
Other definitions for mole (4 of 6)
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): To express the concentration of the substance in solution, use moles per liter.
Other definitions for mole (5 of 6)
Other definitions for mole (6 of 6)
a spicy sauce typically flavored with dark chocolate, chile peppers, and spices, usually served with turkey or chicken: Have you tried making your mole in a slow cooker?
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use mole in a sentence
The oxidation was carried out in dilute aqueous solution of the aldehyde at 20°-40°, using 2-3 mols.Researches on Cellulose | C. F. Cross
They had built Fort Mols at the mouth of the river, and another fort higher up.The Strange Adventures of Andrew Battell | Andrew Battell
I was relieved from the necessity of finding some opening remark by the bursting into the room of "Mols" White.Tell England | Ernest Raymond
The mixed crystal of definite constant melting point (minimum point) contains 59 mols.The Phase Rule and Its Applications | Alexander Findlay
British Dictionary definitions for mole (1 of 6)
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
British Dictionary definitions for mole (2 of 6)
a harbour protected by a breakwater
a large tunnel excavator for use in soft rock
British Dictionary definitions for mole (3 of 6)
pathol a nontechnical name for naevus
British Dictionary definitions for mole (4 of 6)
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, etc: Symbol: mol
British Dictionary definitions for mole (5 of 6)
pathol a fleshy growth in the uterus formed by the degeneration of fetal tissues
British Dictionary definitions for mole (6 of 6)
a spicy Mexican sauce made from chili and chocolate
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
Scientific definitions for mole (1 of 2)
A small, usually pigmented, benign growth on the skin.
Scientific definitions for mole (2 of 2)
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.