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molly

1
[ mol-ee ]
/ ˈmɒl i /
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noun, plural mol·lies.
any of certain livebearing freshwater fishes of the genus Poecilia (formerly Mollienisia), popular in home aquariums.
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Origin of molly

1
First recorded in 1930–35; shortened from New Latin Mollienisia, named after French statesman Count F. N. Mollien (1758–1850); see -ia

Other definitions for molly (2 of 5)

molly2
[ mol-ee ]
/ ˈmɒl i /

noun, plural mol·lies.
a type of expansion bolt having a split, sleevelike sheath threaded at one end so that when inserted snugly into masonry the turning of the bolt draws the ends of the sheath together, thus spreading the sides.

Origin of molly

2
First recorded in 1930–35; formerly a trademark

Other definitions for molly (3 of 5)

molly3
[ mol-ee ]
/ ˈmɒl i /

noun Slang.
Often Molly . MDMA.
any amphetamine.

Origin of molly

3
First recorded in 1975–80; origin uncertain; perhaps a shortening of black molly, a tropical aquarium fish supposedly resembling the black pills; other authorities suggest it is a shortening and alteration of molecule

Other definitions for molly (4 of 5)

molly4
[ mol-ee myool ]
/ ˈmɒl i ˌmyul /

noun
a female mule.
Also called molly mule .

Origin of molly

4
First recorded in 1980–85; generic use of the proper name

Other definitions for molly (5 of 5)

Molly
[ mol-ee ]
/ ˈmɒl i /

noun
a female given name, form of Mary or Milicent.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

How to use molly in a sentence

British Dictionary definitions for molly (1 of 2)

molly1
/ (ˈmɒlɪ) /

noun plural -lies
any brightly coloured tropical or subtropical American freshwater cyprinodont fish of the genus Mollienisia

Word Origin for molly

C19: from New Latin Mollienisia, from Comte F. N. Mollien (1758–1850), French statesman

British Dictionary definitions for molly (2 of 2)

molly2
/ (ˈmɒlɪ) /

noun plural -lies
Irish informal an effeminate, weak, or cowardly boy or man

Word Origin for molly

C18: perhaps from Molly, pet name for Mary
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
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