factor VII

n.
  1. A factor in the clotting of blood that forms a complex with tissue thromboplastin and calcium to activate the prothrombinase, thus acting to accelerate the conversion of prothrombin to thrombin.convertin cothromboplastin proconvertin serum accelerator serum accelerator globulin serum prothrombin conversion accelerator
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.