a. [f. STACK sb. + -LESS.] Without a stack or chimney.
1857. Biblical Recorder, 14 May, 4/4. A story is told of a tribe of Indians who fled from a relentless foe in the stackless forest in the Southwest.
1883. G. P. Lathrop, in Harpers Mag., Aug., 332/2. Eighteen locomotives [are] kept, and several stackless ones for running into the adjacent mines.