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ob- (Latin: prefix; before c, ob- becomes oc- ; before f, ob- becomes of- ; before g, ob- becomes og-; before p, ob- becomes op- ; before m, ob- becomes o-).


toward, to, before:

oblige:
obsequious:
obstetrics:
obverse:
obvert:
against:

obdurate:
obfuscate:
object:
objection:
obloquy:
obnoxious:
obscure:
obsesse:
obstacle:
obstruct:
oppose:
opposition:
oppress:
oppression:
oppressive:
across, over, upon (in the way):


down:


occasion:
completely, totally:

observe:
obsess:
obsolete:
occupy: