rhinarium

from The Century Dictionary.

• noun The area of bare skin around the nostrils of ruminants; the muffle.
• noun In entomology, the nostril-piece; the front part of the nasus, or clypeus, or its equivalent when reduced in size: used in the classification of the Neuroptera. In certain lamellicorn beetles it forms a large sclerite between the clypeus and the labrum.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun tip of a mammal's nose that is mostly wet