Index - O
| odd | Dino.Prelude, Dino |
| Optional | Dino.Expression, Dino |
| optional | Dino.Expression, Dino |
| or | Dino.Expression, Dino |
| Ord | Dino.Prelude, Dino |
| Ordering | Dino.Prelude, Dino |
| orE | Dino.Expression, Dino |
| original | Dino.AST.Diff |
| OtherType | Dino.Types, Dino |
| Otherwise | |
| 1 (Type/Class) | Dino.Expression, Dino |
| 2 (Data Constructor) | Dino.Expression, Dino |
| otherwise | Dino.Prelude, Dino |