Where does “palaeovalley” come from?

palaeovalley (English) comes from English valley, from Middle English valeye, from Old French valee, from Old French val, from Latin vallis, from Proto-Indo-European wēlH-, from Proto-Indo-European welH- — to turn, to wind.

Ancestry of “palaeovalley”, step by step

StepLanguageWordMeaning
1EnglishvalleyAn elongated depression between hills or...
2Middle Englishvaleyevalley depression between hills
3Old Frenchvaleevalley
4Old Frenchvalvalley
5Latinvallisvalley, vale; hollow; dative plural of vāllum
6Proto-Indo-EuropeanwēlH-to roll, to undulate
7Proto-Indo-EuropeanwelH-to turn, to wind
Every word from Proto-Indo-European welH-