also: はかいし
noun
A stone marker placed at a grave, typically inscribed with the deceased's name and dates. Used in both modern and traditional contexts.
お墓参りに行って、墓石をきれいに掃除した。
I visited the grave and cleaned the tombstone.
古い墓石には苔
Moss had grown on the old gravestone.
Compound of 墓 (grave) and 石 (stone). The reading ぼせき is the standard on'yomi combination; はかいし is a mixed reading (kun'yomi for 墓 and on'yomi for 石) that is less common.