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Meaning of close helmet

close' hel"met

Pronunciation: (klōz), [key]
— Armor. Armor.
  1. a completely closed helmet of the late 15th century and after, having a facial defense composed of a visor and beaver or of a visor, ventail, and beaver attached to a pivot on each side.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.