radial engine

noun Aeronautics.
an internal-combustion engine having the cylinders arranged in radial opposition, found mainly on older aircraft.

Origin:
1905–10

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World English Dictionary
radial engine
 
n
an internal-combustion engine having a number of cylinders arranged about a central crankcase

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
In a radial engine, the cylinders are arranged in a circular fashion around the crankcase.
The radial engine was mounted in the center fuselage, with a small propeller to draw in cooling air.
Eyes still closed, hear an early riser pull the propeller through on a radial engine.
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