Distill \Dis*till"\, v. i. [imp. & p. p. {Distilled}; p. pr. & vb. n. {Distilling}.] [F. distiller, from L. destillare, destillatum; de + stillare to drop, stilla a drop, prob. fr. stiria frozen drop, icicle; prob. akin to stare, E. stand. Cf. {Still}, n. & v., {Instill}.] [Written also {distil}.] 1. To drop; to fall in drops; to trickle.
Soft showers distilled, and suns grew warm in vain. --Pope.
2. To flow gently, or in a small stream.
The Euphrates distilleth out of the mountains of Armenia. --Sir W. Raleigh.
3. To practice the art of distillation. --Shak.
This is because moving averages smooth the randomness of the share price series and distil out the underlying trend. Following the trend helps me to profit from market movements.