From this word came the word humidus , the source of the English word humid. Much superstition surrounded the various body liquids in the medieval days.
Good humor is the leaven that leavens the whole lump.
I say 'good' humor to distinguish it from the witless attempts to imitate it and the sterile substitutes we employ in our vaudevillian-like lives. Nothing that hurts or destroys is good humor. Nothing that casts down or denigrates is good humor. For good humor is an attitude and not simply a witty saying or artful phrasing. It sees, and it comments on what it sees.