What's the "een" in Halloween?
late 13c., "furnace;" early 14c., "chimney stack of a fireplace;" late 14c., "fireplace in a residential space;" from Old French cheminee "fireplace; room with a fireplace; hearth; chimney stack" (12c., Modern French cheminée), from Late Latin (camera) caminata "fireplace; room with a fireplace," from Latin caminatus, adjective of caminus "furnace, forge; hearth, oven; flue," from Greek kaminos "furnace, oven, brick kiln." Jamieson  notes that in vulgar use in Scotland it always is pronounced "chimley." Chimney sweep attested from 1610s, earlier chimney sweeper (c.1500).
structure designed to carry off smoke from a fireplace or furnace. A chimney also induces and maintains a draft that provides air to the fire