I. noun — [ mass noun] 1.
‹dated› unconsciousness or incapacity resulting from a cerebral haemorrhage or stroke.
• Browne died of apoplexy.
‹informal› extreme anger
• the decision has aroused apoplexy among environmentalists.
– origin late Middle English: from Old French apoplexie, from late Latin apoplexia, from Greek apoplēxia, from apoplēssein ‘disable by a stroke’.