mol

1 of 8

noun (1)

less common spelling of mole entry 5

: 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

mol

2 of 8

abbreviation

molecular; molecule

mole

3 of 8

noun (2)

ˈmōl 

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

especially : nevus

mole

4 of 8

noun (3)

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

5 of 8

noun (4)

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

mole

6 of 8

noun (5)

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

7 of 8

noun (6)

ˈmōl 

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

8 of 8

noun (7)

mo·​le ˈmō-lā 

: a spicy sauce made with chiles and usually chocolate and served with meat

Synonyms of mol

Noun (3)

• spy
• operative
• agent

Examples of mol in a Sentence

Noun (3)

for years we have had a mole in the enemy's national intelligence agency

Recent Examples on the Web

Noun

Mexican comfort food known for agua frescas, frozen margaritas, enchiladas (mole, salsa verde and sour cream trio), pambazos and desserts. —Ella Gonzales, Fort Worth Star-Telegram, 16 June 2026

The film was decried by the LGBT community even in pre-production, as a mole on set allegedly leaked a copy of the screenplay to passionate advocates like Village Voice columnist Arthur Bell. —Ryan Lattanzio, IndieWire, 11 June 2026

On Watch What Happens Live Tuesday night, Andy Cohen finally identified Jennifer Lawrence as the person who helped Bravo find its mole. —Bethy Squires, Vulture, 10 June 2026

In Mexico City, Centro Culinario Ambrosía teaches the art of Mexican cuisine in a professional kitchen, walking food enthusiasts through Oaxaca’s rich moles and Yucatán’s smoky spices. —Lauren Schuster, Miami Herald, 9 June 2026

Word History

Etymology

Noun (2)

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

Noun (3)

Middle English; akin to Middle Low German mol

Noun (4)

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

Noun (5)

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

Noun (6)

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

Noun (7)

Mexican Spanish, from Nahuatl mōlli sauce

First Known Use

Noun (2)

14th century, in the meaning defined above

Noun (3)

14th century, in the meaning defined at sense 1

Noun (4)

15th century, in the meaning defined above

Noun (5)

circa 1545, in the meaning defined at sense 1

Noun (6)

1902, in the meaning defined above

Noun (7)

1882, in the meaning defined above

Phrases Containing mol

• mole cricket
• mole rat
• naked mole rat
• star-nosed mole

Rhymes for mol

• ahl
• all
• aul
• bawl
• brawl
• call
• caul
• crawl
• dol
• doll
• drawl
• fall

Medical Definition

mol

1 of 2

variant of mole entry 3

mol

2 of 2 abbreviation

molecular; molecule