 O  |
| O.O.P. |
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Abbreviation used in a greyhound's race chart that describes the greyhound as finishing Out Of Picture.
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| O.P. Smith |
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Owen Patrick Smith, inventor of a revolutionary mechanical lure circa 1912 that could travel around a circular track; considered the "father" of American greyhound racing.
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| Oaks |
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A classic race restricted to three-year-old fillies.
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| Odds |
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Chances of winning expressed in dollar terms
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| On the Bit |
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A horse that is racing well and keenly.
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| Open Bet |
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A bet that has not yet been closed.
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