From Longman Dictionary of Contemporary Englishdefunctde‧funct /dɪˈfʌŋkt/ adjective formal USELESSnot existing anymore, or not useful anymore the now-defunct nuclear reactor
Examples from the Corpus
defunct• The north and south traffic on Vermont was separated by tracks for the old yellow trolley cars, long since defunct.• Two of the rooms were fairly large and, from the remaining pipes and sinks, looked to be defunct laboratories.• The new facility abuts tract homes and a defunct oil refinery.• Now they are being embalmed - dutifully and reverentially, as befits faithful but defunct servitors of mankind.• Last year's event was weakened by the fact that it coincided with the now defunct Tokyo Art Expo.Origin defunct (1500-1600) Latin defunctus, past participle of defungi “to finish, die” 