Found in the following dictionaries
TWL06 (NASPA List 2006)
"O" Definition
noun
A zero.
Source: American Heritage Dictionary
Any of the speech sounds represented by the letter o.
Source: American Heritage Dictionary
One of the four major blood groups in the ABO system. Individuals with this blood group have neither A nor B antigens on the surface of their red blood cells, and have both anti-A and anti-B antibodies in their blood serum.
Source: American Heritage Dictionary
Something shaped like the letter O.
Source: American Heritage Dictionary
The 15th in a series.
Source: American Heritage Dictionary
symbol
Oxygen.
Source: Merriam-Webster
abbreviation
Pint.
Source: Merriam-Webster
Ohio.
Source: Merriam-Webster
Offense.
Source: Merriam-Webster
Over.
Source: Merriam-Webster
Order.
Source: Merriam-Webster
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