There are 2 definitions of molly in English:

molly1

Syllabification: mol·ly
Pronunciation: /ˈmälē
 
/
(also mollie)

noun

A small, livebearing freshwater fish that is popular in aquariums and has been bred in many colors, especially black.
  • Genus Poecilia, family Poeciliidae: several species, in particular P. sphenops. See also sailfin molly
More example sentences
  • Many fish lay eggs, but some - including common aquarium fish such as guppies, swordtails, and mollies - retain the eggs inside their bodies until hatching.
  • The company rears popular varieties like goldfish, angelfish, mollies and fighters in its farm near Coimbatore.
  • Female Mexican mollies, P. mexicana, did not discriminate between sworded males and unsworded males based on mating interest.

Origin

1930s: from modern Latin Mollienisia (former genus name), from the name of Count Mollien (1758–1850), French statesman.

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Word of the day iconoclasm
Pronunciation: īˈkänəˌklazəm
noun
attacking or rejecting cherished beliefs or established values...

There are 2 definitions of molly in English:

Molly2

Syllabification: Mol·ly
Pronunciation: /ˈmälē
 
/
(also molly)

noun

US informal
The drug MDMA, especially in powdered or crystalline form: the men were high on Molly
More example sentences
  • Undercover narcotics officers baited pharmaceutical entrepreneurs with entreaties for Molly.
  • Miami Dade police have found that Molly also can contain methylone, a chemical found in bath salts.
  • Molly water is the name for what EDM fans call water with Ecstasy dissolved in it.

Origin

early 21st century: probably after the given name Molly, perhaps influenced by the initial letter of MDMA.

Definition of molly in: