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

 

marmoset

 noun
noun
BrE BrE//ˈmɑːməzet//
 
; NAmE NAmE//ˈmɑːrməzet//
 
 
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a small monkey with a long thick tail, that lives in Central and S America Word Origin late Middle English (also in the sense ‘grotesque figure’): from Old French marmouset ‘grotesque image’, of unknown ultimate origin.
See the Oxford Advanced American Dictionary entry: marmoset