Learn how to say Marmosets correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word marmoset:
a small tropical American monkey with a silky coat and a long tail.
Family Callitrichidae (or Callithricidae): genus Callithrix (three species), and the pygmy marmoset (Cebuella pygmaea)
late Middle English (also in the sense ‘grotesque figure’): from Old French marmouset ‘grotesque image’, of unknown ultimate origin