Where does “glacis” come from?

glacis (French) comes from Old French glacier, from Frankish glīdan, from Proto-Germanic glīdaną, from Proto-Indo-European ǵʰleydʰ- — to glide.

Ancestry of “glacis”, step by step

StepLanguageWordMeaning
1Old Frenchglacierto slip, make slippery; to slip, slide
2Frankishglīdanto slide, glide; to glide, to slide
3Proto-Germanicglīdanąto glide; slide
4Proto-Indo-Europeanǵʰleydʰ-to glide

Words derived from “glacis”

Every word from Proto-Indo-European ǵʰleydʰ- →Every word from Proto-Germanic glīdaną →Every word from Frankish glīdan →