(plural troy grains)
From Troyes, town in Northern France + grain, unit of mass
"troy-grain." YourDictionary, n.d. Web. 14 October 2018. <http://www.yourdictionary.com/troy-grain>.
troy-grain. (n.d.). Retrieved October 14th, 2018, from http://www.yourdictionary.com/troy-grain
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