Source : Webster's Revised Unabridged Dictionary (1913)

Haematogenesis \H[ae]m`a*to*gen"e*sis\, n. [H[ae]mato- +
   genesis.] (Physiol.)
   (a) The origin and development of blood.
   (b) The transformation of venous arterial blood by
       respiration; hematosis.

Source : WordNet®

haematogenesis
     n : the formation of blood cells in the living body (especially
         in the bone marrow) [syn: {hematopoiesis}, {haematopoiesis},
          {hemopoiesis}, {haemopoiesis}, {hemogenesis}, {haemogenesis},
          {hematogenesis}, {sanguification}]