ap ‧ o ‧ plex ‧ y /ˈæpəpleksi/ BrE AmE noun [uncountable] old-fashioned
[ Date: 1300-1400 ; Language: Late Latin ; Origin: apoplexia , from Greek , from apoplessein 'to damage with a stroke' , from apo- ( ⇨ ↑ apocalypse ) + plessein 'to strike' ]
an illness in your brain which causes you to suddenly lose your ability to move or think SYN stroke