Serious bleeding from a blood vessel inside the body, or to lose blood heavily.
From Greek 'haima' (blood) and 'rhegnynai' (to break, burst). The literal meaning is 'blood bursting forth.' The spelling with 'ae' is British English; American English uses 'hemorrhage' with just 'e'.
Greek medical terminology built modern medicine—'haem/hem' (blood), 'cardio' (heart), 'phlebotomy' (vein cutting) all come from Greek, because doctors training in Alexandria 2,000 years ago spoke Greek!
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