←
Middle English coul (link)
←
Middle English cool (link)
←
Proto-Germanic *kōluz (inherited)
←
Proto-Germanic *kōlaz (mention)
←
Proto-Germanic *kulą (inherited)
←
Old High German kuoli (cognate)
←
Old High German kolo (cognate)
←
Proto-Indo-European *gel- (root)
←
Old Norse kol (cognate)
←
Old Frisian kole (cognate)
→
English coal (inherited)
→
Old High German kol (cognate)