an internal-combustion engine having the cylinders arranged in radial opposition, found mainly on older aircraft.
Origin of radial engine
First recorded in 1905–10
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for radial engine
an internal-combustion engine having a number of cylinders arranged about a central crankcase
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012