halberdier hal·ber·dier UK/ˌhælbəɹˈdɪəɹ/ US/ˌhɔlbəɹˈdɪəɹ/ uncommon noun 1. a guard who carries a halberd (as a symbol of his duty) Related words Broader terms guard WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved.