Where does “ācen” come from?

ācen (Old English) comes from Proto-Germanic aikīnaz, from Proto-Germanic -īnaz, from Proto-Indo-European -iHnos, from Proto-Indo-European -no- — adjectival suffix.

Ancestry of “ācen”, step by step

StepLanguageWordMeaning
1Proto-Germanicaikīnazoaken, made of oak
2Proto-Germanic-īnaz-en
3Proto-Indo-European-iHnosCreates adjectives of materials
4Proto-Indo-European-no-adjectival suffix
Every word from Proto-Indo-European -no- →Every word from Proto-Germanic -īnaz →Every word from Proto-Germanic aikīnaz →