gyro-

1.
a combining form meaning “ring,” “circle,” “spiral,” used in the formation of compound words:
gyromagnetic; gyroscope.
Also, especially before a vowel, gyr-.
Origin
< Greek gŷros ring, noun use of gȳrós round
British Dictionary definitions for gyro-

gyro-

combining form
1.
indicating rotating or gyrating motion: gyroscope
2.
indicating a spiral
3.
indicating a gyroscope: gyrocompass
Word Origin
via Latin from Greek guro-, from guros circle
Word Origin and History for gyro-

word-forming element meaning "gyrating" or "gyroscope," from comb. form of Greek gyros "ring, circle" (see gyre).