NOUN (1)

1. an adherent of Sikhism;


ADJECTIVE (1)

1. of or relating to the Sikhs or their religious beliefs and customs;

The Collaborative International Dictionary of English v.0.48:

Sikhs \Sikhs\, n. pl.; sing. Sikh. [Hind. Sikh, properly, a
   disciple.]
   A religious sect noted for warlike traits, founded in the
   Punjab at the end of the 15th century.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Sikh
    adj 1: of or relating to the Sikhs or their religious beliefs
           and customs
    n 1: an adherent of Sikhism