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Definition of: gammadion
(gə·mā′dē·ən) noun
1. A cross made of four capital gammas; a swastika; a fylfot.
2. A Greek cross formed of four capital gammas all facing outward so that the ends of the arms of the cross are open. Also gam·ma′tion (-shən). [<LGk. <gamma, the letter G]
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