What does Boxing Day have to do with boxing?
1829, from Modern Latin meningeus, from meninx "membrane of the brain" (1610s; see meningitis) + -al (1).
plural, 1610s, "the three membranes enveloping the brain and spinal cord," from Middle French meninges (1530s) or directly from medical Latin, plural of meninx, from Greek meninx (see meningitis).
meningeal me·nin·ge·al (mə-nĭn'jē-əl)adj. Of, relating to, or affecting the meninges.
The membranes that surround the brain and spinal cord.