[Meaning] the gut/intestine. Homer throughout calls [sc. this body-part] bellies, not guts/intestines.[1]
And [sc. there is] a proverb: "you cite for me the belly, noblest reproach of all, when full it is lighter, but heavy when empty;" [applied] to those who are gluttonous.[2]
But "belly" is what David called the storehouse of one's thoughts. "My eye was troubled in spirit, my soul and my belly."[3]