The Collaborative International Dictionary of English v.0.48:

Platyrhine \Plat"y*rhine\, a. [Platy + Gr. ?, ?, nose.] (Anat.)
   Having the nose broad; -- opposed to leptorhine. -- n.
   (Zool.) One of the Platyrhini.
   [1913 Webster]

WordNet (r) 3.0 (2006):

platyrhine
    adj 1: of or related to New World monkeys having nostrils far
           apart or to people with broad noses [syn: platyrrhine,
           platyrrhinian, platyrhine, platyrhinian,
           platyrrhinic, broadnosed] [ant: catarrhine,
           catarrhinian, leptorhine, leptorrhine,
           leptorrhinian, leptorrhinic]