O (ō), n.; pl.O'sorOes (ōz). 1. The letter O, or its sound. “Mouthing out his hollow oes and aes.” Tennyson.
2. Something shaped like the letter O; a circle or oval. “This wooden O ”. Shak.
3. A cipher; zero.
Thou art an O without a figure. Shak.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.