Aphasia device

From Memory Alpha, the free Star Trek reference

The aphasia device was the mechanism through which Dekon Elig and Surmak Ren deployed the aphasia virus aboard Deep Space 9. The device was attached to a single replicator on the station and intended to release the virus at a random time. Unfortunately the device did not activate until nearly twenty years later, after the Cardassians had abandonded the station and it had been taken over by Bajorans. (DS9: "Babel")