An Etymological Dictionary of the German Language/Pickelhaube
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Pickelhaube, f., ‘peaked helmet’; MidHG. (13th cent.) beckenhûbe (also beckelhûbe), f., ‘peaked helmet,’ allied to Becken; MidLat. bacinetum, bacilletum, ‘helmet,’ whence also Ital. bacinetto, ‘flat helmet, morion,’ is named from the orig. basin shape of the helmet.