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An engine having a trunk piston, as most internal combustion engines.

to (four-stroke) cycle, though many use the two-stroke cycle. They are almost universally trunk engines and single-acting. Because of the intense heat produced by the frequent explosions, the cylinders must be cooled by a water jacket (water-cooled) or by air currents (air cooled) to give the maximum thermodynamic effi…

for conveying air to a mine or to a furnace, water to a mill, grain to an elevator, etc. Trunk engine, a marine engine, the piston rod of which is a trunk. See Trunk, 10. -- Trunk hose, large breeches formerly worn, reaching to the knees. -- Trunk line, the main line of a railway, canal, or route of conveyance. --…