columbarium

(kŏlˌəm-bârˈē-əm) also col·um·bar·y (kŏlˈəm-bĕrˌē)

1. a. A vault with niches for urns containing ashes of the dead.
   b. One of the niches in such a vault.
2. a. A dovecote.
   b. A pigeonhole in a dovecote.