Type: Term Pronunciation: hē′mō-his′tē-ō-blast′ Definitions: 1. A primordial mesenchymal cell believed to be capable of developing into all types of blood cells, including monocytes, and into histiocytes. Synonyms: Ferrata cell, hematohistioblast Found on http://www.medilexicon.com/medicaldictionary.php?t=40150