spi ‧ na bif ‧ i ‧ da /ˌspaɪnə ˈbɪfədə/ BrE AmE noun [uncountable]
[ Date: 1700-1800 ; Language: Modern Latin ; Origin: 'spine split in two' ]
a serious condition in which a person’s ↑ spine does not develop correctly before they are born, so that their ↑ spinal cord is not protected