Noah Webster
Friction
FRIC'TION, noun [Latin frictio, frico, to rub.]
1. The act of rubbing the surface of one body against that of another; attrition. Many bodies by friction emit light, and friction generates or evolves heat.
2. In mechanics, the effect of rubbing, or the resistance which a moving body meets with from the surface on which it moves.
3. In medicine, the rubbing of the body with the hand, or with a brush, flannel, etc.; or the rubbing of a diseased part with oil, unguent or other medicament.