medulla

(mĭ-dŭlˈə)

1. The inner core of certain organs or body structures, such as the marrow of bone.
2. The medulla oblongata.
3. See myelin.
4. Botany
   a. The pith in the stems or roots of certain plants.
   b. The central portion of a thallus in certain lichens and red or brown algae.

Related Forms:

• me·dulˈlar, medˈul·larˌy (mĕdˈl-ĕrˌē, mə-dŭlˈə-rē) adjective