Where does “earthenwork” come from?

earthenwork (English) comes from English earthen, from English -en, from Middle English -en, from Old English -en, from Old Norse -inn, from Proto-Norse -īna-, from Proto-Germanic -īnaz, from Proto-Indo-European -iHnos — adjectival suffix.

Ancestry of “earthenwork”, step by step

earthenwork traces back through two separate lines of ancestry.

via English earthen

StepLanguageWordMeaning
1EnglishearthenMade of earth or mud; Made of clay; Earthly
2English-enDenotes the past participle form when attached to...
3Middle English-enDenotes the past participle form when attached to...
4Old English-enmæġþ + API → mæġden; cocc + API → cycen, cicen;...
5Old Norse-innUsed to create adjectives from nouns, meaning...
6Proto-Norse-īna-
7Proto-Germanic-īnaz-en
8Proto-Indo-European-iHnosCreates adjectives of materials
9Proto-Indo-European-no-adjectival suffix

via English work

StepLanguageWordMeaning
1Englishwork"Employment."; "Effort."; Sustained effort to...
2Middle Englishwerkwork
3Old Englishweorcwork, in various senses, including
4Proto-West Germanicwerkwork
5Proto-Germanicwerkąwork
6Proto-Indo-Europeanwérǵomwork
7Proto-Indo-Europeanwerǵ-to make
Every word from Proto-Indo-European -no-