Lewis Short
spondēus | spondīus, i | spondaeus | spondēum (noun M.n) = σπονδεῖος: (; sometimes incorrectly written ), , , = , of or belonging to libations; hence
* Substt.
* A vessel used in making libations, App. M. 11, p. 266, 26.
* (Because of its prolonged, solemn character.) A spondee (metrical foot), Cic. Or. 64, 216; Quint. 9, 4, 80 sq.; Hor. A. P. 256; Aus. Ep. 21, 42.
Charlton T. Lewis, Charles Short, A Latin Dictionary