The eruption of this island in 1883 is believed to have made the loudest noise ever heard by humans (8)

(Other definitions for krakatoa that I've seen before include "Site of significant eruption in 1883" , "'Small volcanic Indonesian island, between Java and Sumatra (8)'" , "Indonesian volcano" , "Indonesian island, 1883 site of a huge volcanic eruption" , "Indonesia island, volcano" .)