a cross consisting of an upright crossed in the middle by a horizontal piece of the same length.
Origin of Greek cross
First recorded in 1715–25
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British Dictionary definitions for greek cross
a cross with each of the four arms of the same length
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