- O
- OO1 [ō]n.pl. O's1. popularly the figure zero; nought: in printed matter, zero is usually differentiated from the letter O, as in this dictionary: “O” is the character used for the letter, “0” is the character used for the number2. a blood type: see ABO SYSTEMO2 [ō]interj.1. used in direct address [O Lord!]2. used to express surprise, wonder, fear, pain, etc.: now usually oh3. used at the end of a line in some balladsn.pl. O'san instance of this exclamation: O and oh are now often interchangeableO3abbrev.1. Ocean2. October3. Ohio4. Physics ohm5. Linguis. Old [OFr]6. Ontario7. Baseball out(s)out(s)8. [L octarius] Pharmacy pintO4Chem.symboloxygen
English World dictionary. V. Neufeldt. 2014.