mole

1 of 6

noun (1)

: a pigmented spot, mark, or small permanent protuberance on the human body
especially : nevus

mole

2 of 6

noun (2)

1
: any of numerous burrowing insectivores (especially family Talpidae) with tiny eyes, concealed ears, and soft fur
2
: one who works in the dark
3
: a machine for tunneling
4
: a spy (such as a double agent) who establishes a cover long before beginning espionage
broadly : one within an organization who passes on information

mole

3 of 6

noun (3)

: an abnormal mass in the uterus especially when containing fetal tissues

mole

4 of 6

noun (4)

1
: a massive work formed of masonry and large stones or earth laid in the sea as a pier or breakwater
2
: the harbor formed by a mole

mole

5 of 6

noun (5)

variants or less commonly mol
plural moles
: the base unit of amount of pure substance in the International System of Units that is defined as having exactly 6.02214076 x 1023 indivisible units (such as atoms or molecules) of that substance
First you would need to measure out one mole of salt. Remember that one mole of a compound equals its relative molecular mass in grams, so to obtain one mole of sodium chloride you would weigh out 58.5 g …John Atkinson and Carol Hibbert
one mole of helium contains 4 grams

mole

6 of 6

noun (6)

mo·​le ˈmō-lā How to pronounce mole (audio)
: a spicy sauce made with chiles and usually chocolate and served with meat

Examples of mole in a Sentence

Noun (2) for years we have had a mole in the enemy's national intelligence agency
Recent Examples on the Web
These examples are automatically compiled from online sources to illustrate current usage. Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.
Noun
Black Ops 6 picks up in the early Nineties and follows Cold War character Russell Adler on the run after being framed as a mole in the CIA. Cade Onder, Rolling Stone, 25 Oct. 2024 Her specialties include acne, moles, skin cancer, and eczema. Jenna Ryu, SELF, 7 Oct. 2024 Another standout featured on both menus is the taco mole verde filled with tender pork carnitas that melt in your mouth. Alayna Alvarez, Axios, 27 Sep. 2024 But unlike Medrano, Solis agreed to become a government mole to avoid prison time, wearing a wire to assist corruption investigations into a pair of powerful Chicago Democrats: former Ald. Ray Long, Chicago Tribune, 8 Sep. 2024 See all Example Sentences for mole 

Word History

Etymology

Noun (1)

Middle English, from Old English māl; akin to Old High German meil spot

Noun (2)

Middle English; akin to Middle Low German mol

Noun (3)

Middle English, from Latin mola mole, literally, mill, millstone — more at mill

Noun (4)

Middle French, from Old Italian molo, from Late Greek mōlos, from Latin moles, literally, mass, exertion; akin to Greek mōlos exertion

Noun (5)

German Mol, short for Molekulargewicht molecular weight, from molekular molecular + Gewicht weight

Noun (6)

Mexican Spanish, from Nahuatl mōlli sauce

First Known Use

Noun (1)

14th century, in the meaning defined above

Noun (2)

14th century, in the meaning defined at sense 1

Noun (3)

15th century, in the meaning defined above

Noun (4)

circa 1548, in the meaning defined at sense 1

Noun (5)

1902, in the meaning defined above

Noun (6)

1882, in the meaning defined above

Time Traveler
The first known use of mole was in the 14th century

Dictionary Entries Near mole

Cite this Entry

“Mole.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/mole. Accessed 5 Nov. 2024.

Kids Definition

mole

1 of 3 noun
: a small usually brown and sometimes slightly raised permanent spot on the skin

mole

2 of 3 noun
: any of numerous burrowing mammals with tiny eyes, concealed ears, and soft fur that eat insects

mole

3 of 3 noun
: a pier made of heavy solid material (as concrete or stone) that protects a harbor from rough seas
Etymology

Noun

Old English māl "spot on the skin"

Noun

Middle English mole "burrowing animal"

Noun

from early French mole "stone pier," from early Italian molo (same meaning), derived from Latin moles, literally "a mass"

Medical Definition

mole

1 of 3 noun
: a pigmented spot, mark, or small permanent protuberance on the human body
especially : nevus

mole

2 of 3 noun
: an abnormal mass in the uterus:
a
: a blood clot containing a degenerated fetus and its membranes

mole

3 of 3 noun
variants also mol
: the base unit in the International System of Units for the amount of pure substance that contains the same number of elementary entities as there are atoms in exactly 12 grams of the isotope carbon 12
a mole of photons
a mole of sodium chloride

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