The Collaborative International Dictionary of English v.0.48:

Christian Science \Christian Science\
   A system of healing disease of mind and body which teaches
   that all cause and effect is mental, and that sin, sickness,
   and death will be destroyed by a full understanding of the
   Divine Principle of Jesus' teaching and healing. The system
   was founded by Rev. Mary Baker Glover Eddy, of Concord, N.
   H., in 1866, and bases its teaching on the Scriptures as
   understood by its adherents.
   [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

Christian Science
    n 1: Protestant denomination founded by Mary Baker Eddy in 1866
         [syn: Christian Science, Church of Christ Scientist]
    2: religious system based on teachings of Mary Baker Eddy
       emphasizing spiritual healing