I've been told that the prefix "para" means "against".
- Parachute (against falling)
- Paramilitary (against military)
- Paraply/umbrella (against raining)
But, other words does not make much sense to me:
- Paramedic (against medicine?)
- Paraglider (against gliding?)
Pardon my Ausberger, but why isn't "para" used consistently?