defunct

Short definition from Wiktionary

Adjective

1. 1
   No longer in use or active, nor expected to be again.
2. 2
   No longer in use or active, nor expected to be again: No longer in business or service, nor expected to be again; out of business.
3. 3
   Specifically, of a process: having terminated but not having been reaped (by its parent or an inheritor), and thus still occupying a process slot. See also zombie, zombie process.
4. 4
   (of a language) No longer spoken.
5. 5
   Deceased, dead.

Verb

1. 1
   To make defunct.

Noun

1. 1
   The dead person (referred to).