Of or designating the New World monkeys, distinguished from the Old World monkeys by widely separated nostrils that generally open to the side.
Having a broad flat nose.
A platyrrhine monkey.
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.