on'yomi
reading of kanji in the Japanese language using morphemes borrowed from Chinese (as opposed to kun'yomi, readings using native Japanese morphemes)
go-on
traditional pronunciation on’yomi of kanji characters, originating in 5th and 6th centuries (Northern and Southern Wu dynasties of medieval China, Kofun period Japan), reflecting the Nanjing pronunciation
kan-on
on'yomi originating from 7th to 9th century (Tang dynasty China, Nara period Japan); misnomer, since it is named after the Han dynasty