plat·yr·rhine 
(plătĭ-rīn′)
(plătĭ-rīn′)adj.
1. Of or belonging to the primate infraorder Platyrrhini, characterized by widely separated nostrils that generally open to the side, and including the New World monkeys such as the spider monkeys, marmosets, and titis.
2. Having a broad flat nose.
n.
A platyrrhine monkey.
[New Latin Platyrrhīna, group name, from Greek platurrhīs, broad-nosed : platu-, platy- + rhīs, rhīn-, nose.]