Palmer, Daniel David 1845-1913. Canadian-born American healer who developed chiropractic medicine and founded a school of chiropractic that was later run by his son Bartlett Joshua (1881-1961).American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.