Greek word
rhḗgnymi
ῥήγνυμι
What it means
katágnymi being its intensive, and thraúō a shattering to minute fragments
katágnymi (κατάγνυμι) being its intensive (with the preposition in composition), and thraúō (θραύω) a shattering to minute fragments; but not a reduction to the constituent particles, like lýō (λύω)) or disrupt, lacerate; by implication, to convulse (with spasms); figuratively, to give vent to joyful emotions
Where it comes from
both prolonged forms of (which appears only in certain forms, and is itself probably a strengthened form of (see in katágnymi (κατάγνυμι))) to "break," "wreck" or "crack", i.e. (especially) to sunder (by separation of the parts