Title Word Index : O
| o+ | Blood type | 
|---|
| o− | Blood type | 
|---|
| o1 | Comet Hale–Bopp | 
|---|
| o₂ | Oxygen | 
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| o2si | Silicon dioxide | 
|---|
| o₃ | Ozone | 
|---|
| ὀ | Greek alphabet | 
|---|
| ὄ | Greek alphabet | 
|---|
| ὂ | Greek alphabet | 
|---|
| ὁ | Greek alphabet Pythagoras | 
|---|
| ὅ | Greek alphabet | 
|---|
| ὃ | Greek alphabet | 
|---|
| ό | Greek alphabet | 
|---|
| ὸ | Greek alphabet | 
|---|
| ω | Omega-3 fatty acid Ordinal number | 
|---|
| ὠ | Greek alphabet | 
|---|
| ὤ | Greek alphabet | 
|---|
| ᾤ | Greek alphabet | 
|---|
| ὢ | Greek alphabet | 
|---|
| ᾢ | Greek alphabet | 
|---|
| ᾦ | Greek alphabet | 
|---|
| ᾠ | Greek alphabet | 
|---|
| ὡ | Greek alphabet | 
|---|
| ὥ | Greek alphabet | 
|---|
| ᾥ | Greek alphabet | 
|---|
| ὣ | Greek alphabet | 
|---|
| ᾣ | Greek alphabet | 
|---|
| ᾧ | Greek alphabet | 
|---|
| ᾡ | Greek alphabet | 
|---|
| ώ | Greek alphabet | 
|---|
| ῴ | Greek alphabet | 
|---|
| ὼ | Greek alphabet | 
|---|
| ῲ | Greek alphabet | 
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| ῶ | Greek alphabet | 
|---|
| ῷ | Greek alphabet | 
|---|
| ῳ | Greek alphabet | 
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| ω+1 | Ordinal number | 
|---|
| ω−3 | Omega-3 fatty acid | 
|---|
| о́зеро | Lake Baikal | 
|---|
| оьрсийн | Russia | 
|---|
| ո | Who Wants to Be a Millionaire? | 
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