Definition of "marmoset" in English

noun

1. Any small monkey, now specifically a Central and South American monkey of the genera Callithrix, Mico, Cebuella, and Callibella, with claws instead of nails, and a rather primitive layout.

2. (obsolete) A hideous figure; a grotesque.

3. (derogatory, now rare) An unappealing or foolish man.