prothalamium

from WordNet (r) 3.0 (2006)

prothalamium
    n 1: a song in celebration of a marriage [syn: {prothalamion},
         {prothalamium}]

from The Collaborative International Dictionary of English v.0.48

Prothalamion \Pro`tha*la"mi*on\, Prothalamium
\Pro`tha*la"mi*um\, n. [NL., fr. Gr. ? before + ? chamber,
   especially, the bridal chamber.]
   A song in celebration of a marriage. --Drayton.
   [1913 Webster]