Middle English thorn

← Old English þorn (inherited)

← Proto-Germanic *þurnuz (inherited)

← Proto-Indo-European *tr̥nós (inherited)

→ English thorn (inherited)

→ English Thorn (inherited(en/de))

→ Middle English thorny (affix)

→ Middle English hawthorn (affix)

→ Middle English thornen (affix)

→ Middle English thornen (affix)

→ Middle English thornbak (affix)

→ Middle English thornetre (affix)