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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
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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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
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
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Word Origin and History for gyro-

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

Online Etymology Dictionary, © 2010 Douglas Harper
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Difficulty index for gyro-

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Word Value for gyro

8
8
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