'apoplexy-related' is a compound formed from the noun 'apoplexy' and the adjective-forming element 'related'. 'Apoplexy' originates from Greek, specifically the word 'apoplexia', where 'apo-' meant 'away, off' and 'plēxis' (from plēssō) meant 'a striking, a blow'. 'Related' comes ultimately from Latin 'relatus', the past participle of 'referre', where 're-' meant 'back' and 'ferre' meant 'to carry'.

'Apoplexy' entered English via Late Latin/Old French (Late Latin 'apoplexia', Old French 'apoplexie') and became Middle English 'apoplexie', eventually modern English 'apoplexy'. 'Related' developed from Latin 'relatus' to Anglo-French/Old French forms and Middle English 'relaten'/'relate', yielding modern 'related'.

Initially, 'apoplexy' meant 'a striking down' (a sudden loss of consciousness caused by a cerebral event); over time it came to be used for what we now call 'stroke' or sudden cerebral hemorrhage. 'Related' originally carried senses tied to 'brought back' or 'referred', and evolved to mean 'connected to' or 'pertaining to'.