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Definition of: groin
(groin) noun 
1. Anat. The fleshy hollow where the thigh joins the abdomen. ♦ Collateral adjective: inguinal. 
2. Archit. The line of intersection of two vaults. 
—v.t. To build with or form into groins. [? OE grynde abyss, hollow]
 
				
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