target cell

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun any cell having a specific receptor for an antibody, antigen or hormone
• noun an abnormal red blood cell with a ringed appearance, associated with some anemias

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun any cell that has a specific receptor for an antigen or antibody or hormone or drug, or is the focus of contact by a virus or phagocyte or nerve fiber etc.
• noun an abnormal red blood cell with the appearance of a dark ring surrounding a dark center; associated with anemia