noun
funerary urn; cremation urn
A container for the ashes of a cremated person, used in Japanese Buddhist funerary rites.
火葬の後、遺骨を骨壷に納めます。
After cremation, the remains are placed in a funerary urn.
お墓の下に骨壷が埋められています。
A funerary urn is buried under the grave.
Compound of 骨 (kotsu, 'bone') and 壷 (tsubo, 'pot, jar'). The reading こつつぼ is a straightforward combination of the on'yomi of 骨 and the kun'yomi of 壷.