rhi·nar·i·um \rīˈna(a)rēəm\noun (pluralrhinar·ia \-ēə\) Etymology: New Latin, from Greek rhin-, rhis nose + New Latin -arium 1.: the lower part of the clypeus in some insects (as dragonflies) 2.: the hairless area of roughened skin at the tip of the snout of a mammal