Tō-on, a Sino-Japanese kanji pronunciation layer; imported to Japan beginning in the mid-Heian period and ending in the Edo period. Uncommon. / (more specifically) The later subset of above.

obligation

a greenhouse (building in which plants are grown more quickly than outside) / a hot bathhouse in a Buddhist temple

temperature (a measure of cold or heat)

(phonology) a phoneme

(linguistics) Received Pronunciation

lion

Kan'on, a Sino-Japanese kanji pronunciation layer; based mainly on the Chinese pronunciation in use in the areas around Chang'an (around modern-day Xi'an) and Henan, as imported into Japanese in the Nara period and the early Heian period in Japanese history, and roughly from the late Tang Dynasty through the early Song Dynasty in Chinese history. The predominant layer used in Japanese today, as opposed to the other layers which are associated with restricted sets of words (Buddhism, etc.).

water temperature

(the sound of one's) heartbeat