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English mellow
← Old English meru (inherited)
← Old English mearu (mention)
← German mürbe (cognate)
← Middle English melowe (inherited)
← Middle English melwe (mention)
← Middle English merow (cognate)
← Middle English merwe (mention)
← West Frisian murf (cognate)
← Proto-Germanic *marwaz (inherited)
← Proto-Indo-European *mer(w)- (derived)
← Icelandic meyr (cognate)
← German Low German möör (cognate)
← Dutch murw (cognate)
← Old Norse mör (cognate)
← Saterland Frisian muur (cognate)

→ English mellowly (suffix)
→ English mellowness (suffix)
→ English overmellow (prefix)
→ English mellowy (affix)
→ English melloweth (suffix)
→ English mellowish (suffix)
→ English unmellow (prefix)
→ English mellowspeak (suffix)
→ Danish mør (cognate)
→ German mürbe (cognate)
→ Alemannic German murw (cognate)
→ Dutch murw (link)