Main Entry: me·dul·la

Pronunciation: \mə-ˈdə-lə\

Function: noun

Inflected Form(s): plural me·dul·las or me·dul·lae \-(ˌ)lē, -ˌlī\

Etymology: Middle English, from Latin

Date: 15th century

1 plural medullae a : bone marrow b : medulla oblongata
2 a : the inner or deep part of an animal or plant structure <the adrenal medulla> b : myelin sheath