“Lau” originally comes from ‘well’. Thusmoderately warm or pleasantly mild. The reference to liquids is clear, and water (Old High German wazzar) belongs to the Indo-European root *wēd or *wŏd, cf. English wet, “moist.” The word “intoxication” originally meant an impetuous movement and was not substance-related drunkenness until the 16th century. Noise, on the other hand, also called “background” in physics, consists of frequencies that can produce acoustic signals with different waves.