A promonocyte (or premonocyte) is a cell arising from a monoblast and developing into a monocyte.

• Pluripotential hemopoietic stem cell

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  Hematopoiesis
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  Schematic image of a promonocyte

• "Monocyte Development" at tulane.edu
• Slide at marist.edu
• Histology image: 75_17 at the University of Oklahoma Health Sciences Center - "Bone marrow smear"
• "Maturation Sequence" at hematologyatlas.com (Promonocyte is in seventh row.)