headshield

Noun

1. A helmet or similar covering that protects the head.
   • Two new molded fiber-glass plastic headshields for weldors are reported to offer the user lighter weight comfort with complete head protection from the welding arc and spatter. - 1955, The Welding Engineer, volume 40,...
2. A cephalon of a trilobite.
   • Trilobites have a distinct headshield or cephalon and a distinct tailshield or pygidium, and in both these regions the original segmentation has been suppressed — more completely in the cephalon than in the pygidium —...