catarrhinian adj 1: of or related to Old World monkeys that have nostrils together and opening downward [syn: {catarrhine}, {catarrhinian}] [ant: {broadnosed}, {leptorhine}, {leptorrhine}, {leptorrhinian}, {leptorrhinic}, {platyrhine}, {platyrhinian}, {platyrrhine}, {platyrrhinian}, {platyrrhinic}]