Noun has 1 sense

• platyrrhinian(n = noun.animal) new world monkey, platyrrhine - hairy-faced arboreal monkeys having widely separated nostrils and long usually prehensile tails;

Adjective has 1 sense

• platyrrhinian(a = adj.all) broadnosed, platyrhine, platyrhinian, platyrrhine, platyrrhinic - of or related to New World monkeys having nostrils far apart or to people with broad noses;
Derived form noun platyrrhine₁