音读

yīn dúyindu

1. reading or phonetic value of a character
2. (Japanese linguistics) on-reading, a pronunciation of a kanji derived from its pronunciation in a Sinitic language at the time it was imported from China (Note: An on-reading of a character is distinguished from its kun-reading(s) 訓讀|训读[xun4 du2]. For example, 山 has an on-reading "san" and a kun-reading "yama".)

Study it in Yanamino