lobster-tail helmet

[ lob-ster-teyl ]
/ ˈlɒb stərˌteɪl /

noun Armor.

a burgonet fitted with a long, articulated tail of lames for protecting the nape of the neck, worn by cavalry in the 17th century.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019