epithalamium
Concise Oxford English Dictionary © 2008 Oxford University Press:
epithalamium /ˌɛpɪθəˈleɪmɪəm/
▶noun (pl. epithalamiums or epithalamia) a song or poem celebrating a marriage.
– derivatives
epithalamic /-ˈlamɪk/ adjective.
epithalamic /-ˈlamɪk/ adjective.
– origin C16: via L. from Gk epithalamion, from epi ‘upon’ + thalamos ‘bridal chamber’.
'epithalamium' also found in these Oxford entries:

