Definition of the Italian term bombardone in music:
contrabass brass saxhorn (similar to the bass tuba in F or E-flat)
bombard (the alto, tenor, and bass members of the shawm family)
historically referring to different bass members of the brass instrument family
organ reed stop of 32', 16' or 8' pitch with a somewhat powerful tone (usually played with the pedals, equivalent to "Bombardon" in English and French)