Definition of molly noun from the Oxford Advanced Learner's Dictionary

 

molly

 noun
noun
BrE BrE//ˈmɒli//
 
; NAmE NAmE//ˈmɑːli//
 
(pl. mollies) Fish
 
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a small fish that is often put into aquariums See related entries: Fish Word Origin 1930s: from modern Latin Mollienisia (former genus name), from the name of Count Mollien (1758–1850), French statesman.
See the Oxford Advanced American Dictionary entry: molly