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| Oar |
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A pole with a flat section, known as the blade, near the end, used for propelling a boat through the water. |
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| Oarlock |
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A latch that holds the oar and provides a fulcrum for the stroke. |
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| Off Keel |
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Descriptive of an unbalanced boat. |
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| Official |
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An administrator who follows the race in a motorboat to ensure that all boats stay in their designated lanes. |
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| On Keel |
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Descriptive of a balanced and level boat. |
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| Outboard |
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The distance from the oarlock to the tip of the oar's blade. |
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