Webster's Revised Unabridged Dictionary · 1913

Haematogenesis

Haematogenesis (hem`ȧ*to*jen"e*sis o hē`mȧ*to-) , noun

[Haemato- + genesis.]

(a)
(Physiology) The origin and development of blood.
(b)
(Physiology) The transformation of venous into arterial blood by respiration; hematosis.