any of a group of American monkeys, e.g. the marmosets, tamarins, and capuchins, which have flattened noses with widely spaced nostrils, and prehensile tails: compare catarrhine

(used before a noun) relating to or denoting this group of monkeys or a monkey that belongs to this group

a person with a broad flattened nose

(used before a noun) relating to or denoting this type of person