Source : Webster's Revised Unabridged Dictionary (1913)

Defunct \De*funct"\ a. [L. defunctus, p. p. of defungi to acquit
   one's self of, to perform, finish, depart, die; de + fungi to
   perform, discharge: cf. F. d['e]funt. See {Function}.]
   Having finished the course of life; dead; deceased. ``Defunct
   organs.'' --Shak.

         The boar, defunct, lay tripped up, near. --Byron.

Defunct \De*funct"\, n.
   A dead person; one deceased.

Source : WordNet®

defunct
     adj 1: no longer in force or use; inactive; "a defunct (or dead)
            law"; "a defunct organization" [syn: {dead}]
     2: having ceased to exist or live; "the will of a defunct
        aunt"; "a defunct Indian tribe"