From Longman Dictionary of Contemporary Englishdefunctde‧funct /dɪˈfʌŋkt/ adjective formalUSELESSnot existing anymore, or not useful anymorethe now-defunct nuclear reactorExamples from the Corpusdefunct• The north and southtraffic on Vermont was separated by tracks for the old yellowtrolley cars, long since defunct.• Two of the rooms were fairly large and, from the remaining pipes and sinks, looked to be defunctlaboratories.• The new facilityabutstract homes and a defunct oil refinery.• Now they are being embalmed - dutifully and reverentially, as befitsfaithful but defunct servitors of mankind.• Last year's event was weakened by the fact that it coincided with the now defunct Tokyo Art Expo.Origindefunct(1500-1600)Latindefunctus, past participle of defungi"to finish, die"