| item | description | category | filter | more on... |
| OS | Left eye (oculus sinister) | Medical/Physiology |
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| OS | Mouth | Medical/Physiology |
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| OS | Ocular Sinister | Medical/Physiology |
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| OS | Oculus Sinister - Left Eye | Medical/Physiology |
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| OS | Off-Street parking | Other/Housing |
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| OS | Old Skool | Governmental/Military |
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| OS | OmniSky | Business/Firms |
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| OS | On Sea | Governmental/Military |
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| OS | On Service | Governmental/Military |
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| OS | On Sheet | Business/Accounting |
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| OS | On Station | Governmental/Military |
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| OS | On-Orbit Station | Governmental/NASA |
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| OS | One Size | Misc/Chess |
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| OS | Online Services | IT/Networking |
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| OS | Open Server | IT/Networking |
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| OS | Open Sockets | IT/Software |
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| OS | Open Source | IT/Software |
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| OS | Open Source | IT/General |
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| OS | Open Street | Business/Stock Exchange |
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| OS | Open System | IT/General |
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