filum terminale

noun

fi·lum ter·mi·na·le | \ ˈfī-ləm-ˌtər-mə-ˈnā-(ˌ)lē

, ˈfē-ləm-ˌter-mə-ˈnäl-ˌā

plural fila terminalia\ ˈfī-lə-tər-mə-ˈnā-lē-ə

, ˈfē-lə-ˌter-mə-ˈnäl-ē-ə

Medical Definition of filum terminale

: the slender threadlike prolongation of the spinal cord below the origin of the lumbar nerves : the last portion of the pia mater