Source : Webster's Revised Unabridged Dictionary (1913)

Hymeneal \Hy`me*ne"al\, Hymenean \Hy`me*ne"an\, a. [L.
   hymeneius, a., also Hymenaeus, n., Hymen, Gr. ? the wedding
   song, also ? Hymen: cf. F. hym['e]n['e]al, hym['e]n['e]en.]
   Of or pertaining to marriage; as, hymeneal rites. --Pope.

Hymeneal \Hy`me*ne"al\, Hymenean \Hy`me*ne"an\, n.
   A marriage song. --Milton.

Source : WordNet®

hymeneal
     adj : of or relating to a wedding or marriage; "hymeneal rites"
     n : a wedding hymn