me·dul·la (m -d l  )n. pl. me·dul·las or me·dul·lae (-d l ) 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. [Middle English, from Latin, perhaps alteration (influenced by medius, middle; see medial) of *merulla.] me·dul lar, medul·lar y (m dl-r, m-dl-r) adj. |
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