(linguistics) the reading of a Japanese word written in kanji that is roughly based on the pronunciation of the kanji characters in the originating Chinese dialect at the time the word was introduced into Japanese

to use the on'yomi of a word, to read a word using the pronunciation based on the original Chinese pronunciation

The pronunciation of Chinese hanzi characters used in the Wú (Japanese 吳 (Go)) and Yuè (Japanese 越 (Etsu)) regions of China.

a hot spring / a spa, an onsen

pronunciation

to pronounce

(informal) An emoticon indicating a singsong tone of voice or playful attitude.

water temperature

(the sound of one's) heartbeat

the speed of sound