Noah Webster
Thinness
THIN'NESS, noun The state of being thin; smallness of extent from one side or surface to the opposite; as the thinness of ice; the thinness of a plate; the thinness of the skin.
1. Tenuity; rareness; as the thinness of air or other fluid.
2. A state approaching to fluidity, or even fluidity; opposed to spissitude; as the thinness of honey, of white wash or of paint.
3. Exility; as the thinness of a point.
4. Rareness; a scattered state; paucity; as the thinness of trees in a forest; the thinness of inhabitants.