The Collaborative International Dictionary of English v.0.48:

Samaritan \Sa*mar"i*tan\, a. [L. Samaritanus.]
   Of or pertaining to Samaria, in Palestine. -- n. A native or
   inhabitant of Samaria; also, the language of Samaria.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Samaritan
    n 1: a member of the people inhabiting Samaria in biblical times

Moby Thesaurus II by Grady Ward, 1.0:

18 Moby Thesaurus words for "Samaritan":
   aid, aider, assister, backer, befriender, benefactor, benefactress,
   benefiter, good Samaritan, good person, help, helper, helping hand,
   jack-at-a-pinch, ministering angel, ministrant, patron, succorer