The Parsi (Zoroastrian) Tower of Silence at Deolali, India. The name of the town is the source of the British slang noun "doolally tap", loosely meaning "camp fever", referring to the apparent madness of men waiting for ships back to Britain. By the 1940s this had been shortened to "doolally". A Tower of Silence or Dakhma is a circular, raised structure used by Zoroastrians for exposure of the dead and hence consumption by vultures.