noun
molly
MO-lee
noun
1
(slang) The pure powder or crystal form of the drug MDMA.
"Police said the pills tested positive for molly."
2
A small live-bearing tropical fish popular in home aquariums.
"She kept a few mollies in her freshwater tank."
name
1
A female given name, a pet form of Mary.
"Molly started her new job on Monday."
How to Use Molly
Learner’s notesIn plain EnglishMost often either the recreational drug MDMA in powder form, a popular aquarium fish, or a common given name.
When to use it
The drug sense is informal slang.
Word Forms
mollied past tense, mollies plural, mollies plural, mollies plural, mollies singular
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Etymology
From the personal name Molly, a pet form of Mary; the drug sense likely comes from "molecular," referencing pure MDMA.