Home › Words › P › poleynpoleyn/ˈpɒlɪn/poleyn means the part of medieval armour that protected the knee.poleyn is pronounced /ˈpɒlɪn/.EtymologyFrom Middle English polein(e) (“knee armor”), from Anglo-Norman polein (“knee armor”). Possibly related to poulaine (“pointed toe on a shoe”).nounThe part of medieval armour that protected the knee.Definitions & examples from Wiktionary (CC BY-SA 3.0).