Found 41,300 abbreviations starting with O:

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O	Over Business » Accounting	Rate it:
O	Occult Academic & Science » Astronomy	Rate it:
O	Oblivion Academic & Science » Astronomy	Rate it:
O	Organism Academic & Science » Biology	Rate it:
O	Ovangkol Academic & Science » Botany	Rate it:
O	Oh Internet » Chat	Rate it:
O	Oxygen Academic & Science » Chemistry	Rate it:
O	Odor Academic & Science » Chemistry	Rate it:
O	Overall impression Medical » Clinical Medicine	Rate it:
O	New Orleans, Louisiana (mint mark on US coins) Miscellaneous » Coins	Rate it:
O	Orange Miscellaneous » Colors	Rate it:
O	Outside Miscellaneous » Colors	Rate it:
O	Oldest Community	Rate it:
O	Optimism Community	Rate it:
O	Orchidist Community	Rate it:
O	Obesity Medical » Diseases	Rate it:
O	Oplegger International » Dutch	Rate it:
O	Output Academic & Science » Electronics	Rate it:
O	Operating Academic & Science » Electronics	Rate it:
O	Off Academic & Science » Electronics	Rate it:
O	form O solenoid (actuator Only, no contacts) Academic & Science » Electronics	Rate it:
O	Hug Internet » Emoticons	Rate it:
O	Oprah Community » Famous & Celebs	Rate it:
O	Office Governmental » FBI Files	Rate it:
O	UNIX Object file Computing » File Extensions	Rate it:

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A A Non-Elderly Dementia

B Alive No Evidence of Disease

C Activities for Non Elderly Dementia

D Arrived Near Emergency Department