promyelocyte

[prō-mīə-lə-sīt′]
n.
  1. A cell containing a few granules formed in the transition from myeloblast to myelocyte during the development of a granulocyte; it is the predominant cell type seen in granulocytic leukemia.granular leukoblast progranulocyte
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.