praefurnĭum, i, n. [prae-furnus].
I The opening of a furnace , the door by which fuel is admitted: si uno praefurnio coques, Cato R. R. 38, 1.—
II The heating-room , or hot anteroom of a bath, = προπνιγεῖον, Vitr. 5, 10, 2; 7, 10.