| OU | a river that rises in western Arkansas and flows southeast into eastern Louisiana to become a tributary of the Red River |
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| OU | a river that rises in western Arkansas and flows southeast into eastern Louisiana to become a tributary of the Red River |
| OU | a dungeon with the only entrance or exit being a trap door in the ceiling |
| OU | expresses an emotional, practical, or other reason for doing something |
| OU | be logically necessary |
| OU | the basic unit of money in Mauritania |
| OU | a board with the alphabet on it |
| OU | a board with the alphabet on it |
| OU | large feline of upland central Asia having long thick whitish fur |
| OU | a unit of weight equal to one sixteenth of a pound or 16 drams or 28.349 grams |
| OU | a unit of apothecary weight equal to 480 grains or one twelfth of a pound |
| OU | common yellow-flowered perennial bedstraw |