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Obsolete means no longer valid or relevant, or out of date.
Ex: Now that the new operating system is out, the old Windows XP seems so obsolete.
The dictionary of 2001 was so obsolete that the library was forced to take it off the shelves.
Dropsy
Digamma. This obsolete letter of the Greek alphabet was primarily used as a Greek numeral.
Nephrotic
The oboe.