med·ul·lat·ed \ˈmedəlˌād.ə̇d, ˈmejəˌlā-, mə̇ˈdəˌlā-\adjective Etymology: Late Latin medullatus having a marrow (from Latin medulla marrow + -atus -ate) + English -ed — more at medulla 1.of a nerve fiber: having a medullary sheath 2.of other fibers: having a medulla < kempy wool contains many coarse medullated fibers >