Op-, as in oppress. See Ob-.
Or- (A.S.), out, in ordeal. [A.S. or-; cog. with Dut. oor-, Ger. ur-, Goth, us-, away, out of.]
Os-, as in ostensible. See Ob-.
Out- (A.S.), out, beyond, as outlaw, outbid, outside, outcast. [A.S. út.]
Over- (A.S.), over, above, as overarch, overseer. [A.S. ofer.]
Pa-, as in palsy. See Para-.
Palin-, Palim- (Gr.), again, as palingenesis, palimpsest. [Gr. palin, again.]
Pan-, Panto- (Gr.), all, as panacea, pantheism, pantomime.
Para-, Par- (Gr.), beside, as parable; beyond, wrong, as paralyse. It appears as pa- in palsy, par- in parody. [Gr. para.]
Pel-, as in pellucid. See Per-.