medulla
noun
- innermost layer of the hair shaft
Wiktionary
Pronunciation: /məˈdʌlə/ / /mɛˈdʌlə/ / /məˈdulə/
noun
Etymology: Borrowed from Latin medulla (“pith, marrow”), perhaps from medius (“middle”).
- The soft inner part of something, especially the pith of a fruit.
- The inner substance of various organs and structures, especially the marrow of bones.
- The medulla oblongata.
- The internal tissue of a plant.