prūna

I. a burning coal, live coal (cf. carbo): medium per ignem multā premimus vestigia prunā, Verg. A. 11, 788 Serv.; 5, 103: latum clavum prunaeque batillum, Hor. S. 1, 5, 36; Plin. 20, 6, 23, § 54; 29, 3, 11, § 45 al.