a combining form meaning “ring,” “circle,” “spiral,” used in the formation of compound words: gyromagnetic; gyroscope.
Also especially before a vowel, gyr-.

Origin of gyro-

< Greek gŷros ring, noun use of gȳrós round Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for gyro-


before a vowel gyr-

combining form

indicating rotating or gyrating motiongyroscope
indicating a spiral
indicating a gyroscopegyrocompass

Word Origin for gyro-

via Latin from Greek guro-, from guros circle
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