descale

verb

Etymology: Etymology tree Proto-Indo-European *de Proto-Indo-European *-h₁ Proto-Indo-European *déh₁ Proto-Italic *dē Latin dē Latin dē-der. English de- Proto-Indo-European *skend-der. Proto-Indo-European *(s)kn̥d-sleh₂ Proto-Italic *skand-slā Latin scālabor. Middle English scale English scale English descale From de- + scale.

1. To remove scale from the surface of a metal, especially from the inner surfaces of boilers etc.
2. To remove the scales from a fish etc.