Greek φτερό

← English feather (mention)

← Proto-Germanic *feþrō (cognate)

← Ancient Greek πτερόν (inherited)

← Hittite 𒁁𒋻 (cognate)

← Proto-Indo-European *péth₂r̥ (derived)

← Sanskrit पत्र (cognate)

→ West Frisian fear (cognate)

→ Serbo-Croatian ptica (cognate)