Index - D
| d | Turtle.Format, Turtle |
| date | Turtle.Prelude, Turtle |
| datefile | Turtle.Prelude, Turtle |
| decimal | Turtle.Pattern, Turtle |
| decodeString | Turtle |
| Description | |
| 1 (Type/Class) | Turtle.Options, Turtle |
| 2 (Data Constructor) | Turtle.Options, Turtle |
| die | Turtle.Prelude, Turtle |
| digit | Turtle.Pattern, Turtle |
| directory | Turtle |
| dirname | Turtle |
| dot | Turtle.Pattern, Turtle |
| dropExtension | Turtle |
| du | Turtle.Prelude, Turtle |