also: いしむろ
noun
stone hut; rock chamber
A small structure or room made of stone, often used for storage, shelter, or as a simple dwelling. The reading いしむろ is rare and limited to this sense.
山の中に古い石室が残っている。
An old stone hut remains in the mountains.
Specifically a stone-built tomb or burial chamber, often associated with ancient burial mounds (古墳). Only read as せきしつ.
古墳の石室から副葬品が出土した。
Grave goods were excavated from the stone burial chamber of the ancient tomb.