col·um·bar·i·um 
(kŏl′əm-bârē-əm) also col·um·bar·y (kŏləm-bĕr′ē)
(kŏl′əm-bârē-əm) also col·um·bar·y (kŏləm-bĕr′ē)n. pl. col·um·bar·i·a (-ē-ə) also col·um·bar·ies
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.
[Latin columbārium, sepulchre for urns, dovecote, from columba, dove.]