Entry 1 sense Webster, 1913 Haematogenesis /(hĕm`ȧ*tō̇*jĕn"ē̇*sĭs [or] hē`mȧ*tō̇-)/ · Haem·a·to·gen·e·sis · IPA 01 n. The origin and development of blood. 1. The origin and development of blood.(Physiol.)