The Collaborative International Dictionary of English v.0.48:

Brahman \Brah"man\, Brahmin \Brah"min\, n.; pl. Brahmans,
   Brahmins. [Skr. Br[=a]hmana (cf. Brahman worship, holiness;
   the God Brahma, also Brahman): cf. F. Brahmane, Brachmane,
   Bramine, L. Brachmanae, -manes, -mani, pl., Gr. ?, pl.]
   1. A person of the highest or sacerdotal caste among the
      Hindus.
      [1913 Webster]

   Brahman bull (Zool.), the male of a variety of the zebu, or
      Indian ox, considered sacred by the Hindus.
      [1913 Webster]

   2. a person from an old, respected, and usually wealthy
      family who has considerable social or political influence;
      -- a term used especially in New England; as, a Boston
      brahmin.
      [PJC]