anomer

[ănə-mər]
n.
  1. A cyclic stereoisomer, such as a sugar, whose sole conformational difference involves the arrangement of atoms or groups in the aldehyde or ketone group.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.