(n.) A sepulchral chamber with niches for holding cinerary urns.
Example Sentences:
(1) Alternatively, there is an average five-year wait for a small spot in a public columbarium, where thousands of urns of cremated ashes are stored.
(2) Amid the scramble to accommodate the urban dead, one Hong Kong-based design studio has developed a prototype for an off-shore columbarium island called “Floating Eternity”, which could hold 370,000 urns at sea.