The building blocks of English

Affixes

-poiesis

Also ‑poietic.

Production, formation.

Greek poiēsis, making.

These are medical terms. Haemopoiesis (US hemopoiesis) or haematopoiesis (US hematopoiesis)(all from Greek haima, haimat‑, blood) is the production of blood cells and platelets, which occurs in the bone marrow; erythropoiesis (Greek eruthros, red) refers specifically to the production of red blood cells; lymphopoiesis is the formation of lymphocytes. Associated adjectives are formed in ‑poietic: erythropoietic, haemopoietic.