From The Collaborative International Dictionary of English v.0.48:
Kiln \Kiln\ (k[i^]ln or k[i^]l), n. [OE. kilne, kulne, AS. cyln,
cylen; akin to Icel. kylna; prob. from the same source as
coal. See Coal.]
1. A large stove or oven; a furnace of brick or stone, or a
heated chamber, for the purpose of hardening, burning, or
drying anything; as, a kiln for baking or hardening
earthen vessels; a kiln for drying grain, meal, lumber,
etc.; a kiln for calcining limestone.
[1913 Webster]
2. A furnace for burning bricks; a brickkiln.
[1913 Webster]