Definitions for "Giffen good"
A good that is so inferior and so heavily consumed at low incomes that the demand for it rises when its price rises. The reason is that the price increase lowers income sufficiently that the positive income effect (because it is inferior) outweighs the negative substitution effect.
a good that exeriences increased demand for when the price rises and decreased demand for when the price falls
an inferior good that absorbs so much of the income of impoverished people that the quantity demand rises when its price rises
a basic commodity that absorbs a large proportion of a poor population's income