ˈkau̇dəeˈkwēnə, ˈkȯdəēˈkwīnə noun
( plural cau·dae equi·nae ˈkau̇ˌdīe ˈkwēˌnī, ˈkȯˌdēəˈkwīˌnē)
Etymology: New Latin, from Latin, horse's tail
: the roots of the upper sacral nerves which are of great length because the spinal cord does not extend beyond the first lumbar vertebra and which form a bundle of filaments within the spinal canal