noun
oval tombstone; egg-shaped gravestone
Refers to a tombstone with a rounded, egg-like top, often seen in Japanese cemeteries.
古い墓地には卵塔が並んでいる。
In the old cemetery, oval tombstones stand in rows.
The term combines 卵 (egg) and 塔 (tower/pagoda), describing the shape. The alternate spelling 蘭塔 uses 蘭 (orchid), possibly a phonetic or decorative substitution, but the exact derivation is uncertain.