Christchurch chromosome

[krīstchûrch′]
n.
  1. An abnormal small acrocentric chromosome with complete or almost complete deletion of the short arm; it is found in the white blood cells in some cases of chronic lymphocytic leukemia.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.