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.
prūna root in Gr. πῦρ, fire, ae, f.,