v. t. [ 1st pref. un- + helm. ] To deprive of the helm or helmet. Sir W. Scott. [ 1913 Webster ]
a. 1. [ Properly p. p. of unhelm. ] Divested or deprived of the helm or helmet. [ 1913 Webster ]
2. [ Pref. un- not + helm. ] Not wearing a helmet; without a helmet. Sir W. Scott. [ 1913 Webster ]
v. t. [ 1st pref. un- + helmet. ] To deprive of the helmet. Sir W. Scott. [ 1913 Webster ]