noun
hourglass drum used in Nara-period court music
A specific drum associated with 高麗楽 (komagaku), a genre of ancient Japanese court music. The term is historical and rarely encountered outside specialized contexts.
See also: 高麗楽
三の鼓は、高麗楽で用いられた砂時計型の太鼓である。
The san no tsuzumi is an hourglass-shaped drum used in komagaku.