Fat"ness, n.
1.
The quality or state of being fat, plump, or full-fed; corpulency; fullness of flesh.
Their eyes stand out with fatness.
Ps. lxxiii. 7.
2.
Hence; Richness; fertility; fruitfulness.
Rich in the fatness of her plenteous soil.
Rowe.
3.
That which makes fat or fertile.
The clouds drop fatness.
Philips.
© Webster 1913.