Crossword clues for -- mater (brain cover) 3 letters:PIA__ mater (brain covering)PIA__ mater (brain cover)PIA____ mater (brain cover)PIA___ mater (brain cover)PIA___ mater (brain covering)PIA-- mater (brain cover)DURA__ mater (brain covering)DURA___ mater (brain covering)DURA__ mater (brain cover)DURA___ mater (brain cover)XXXX___ mater (brain cover)