from The American Heritage® Dictionary of the English Language, 4th Edition
- n. An engine whose crankshaft is turned by pistons moving up and down in a cylinder.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. piston engine
from the GNU version of the Collaborative International Dictionary of English
- intransitive v. a steam, air, or gas engine, etc., in which the piston moves back and forth; -- in distinction from a rotary engine, in which the piston travels continuously in one direction in a circular path.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. an internal-combustion engine in which the crankshaft is turned by pistons moving up and down in cylinders
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