The Collaborative International Dictionary of English v.0.48:

Nez Perc'es \Nez" Per`c['e]s"\, pl.; sing. Nez Perc['e]. [F.,
   pierced noses.] (Ethnol.)
   A tribe of Indians, in the late 1800's mostly inhabiting
   Idaho. They were involved under Chief Joseph, in the last
   major battle of the Indian wars, attempting to resist being
   moved to a reservation.
   [1913 Webster +PJC]

WordNet (r) 3.0 (2006):

Nez Perce
    n 1: a member of a tribe of the Shahaptian people living on the
         pacific coast
    2: the Shahaptian language spoken by the Nez Perce

U.S. Gazetteer Counties (2000):

Nez Perce -- U.S. County in Idaho
   Population (2000):    37410
   Housing Units (2000): 16203
   Land area (2000):     849.079992 sq. miles (2199.106991 sq. km)
   Water area (2000):    7.278733 sq. miles (18.851831 sq. km)
   Total area (2000):    856.358725 sq. miles (2217.958822 sq. km)
   Located within:       Idaho (ID), FIPS 16
   Location:             46.410602 N, 116.862484 W
   Headwords:
    Nez Perce
    Nez Perce, ID
    Nez Perce County
    Nez Perce County, ID