† plangorObs.rare—1. [a. L. plangor noisy beating, loud lamenting, f.plangĕre: see plangent.] A loud or piercing lamentation. 1598Meres Pallad. Tamia 280 b, Euery one mourneth when hee heareth of the lamentable plangors of Thracian Orpheus for his dearest Euridice.