Nagercoil (näˈgərkoil) [key], city (1991 pop. 190,084), Tamil Nadu state, S India. Nagercoil is the southernmost city in India. It is a district administrative center, with industries in motor repair, rubber goods, and rice- and cotton-milling. Ilmenite and monazite are mined. It is an important Christian center in the primarily Hindu country of India.