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From The Collaborative International Dictionary of English v.0.48:
groat \groat\ (gr[add]t or gr[=o]t), n. [LG. gr[=o]te, orig., great, that is, a great piece of coin, larger than other coins in former use. See Great.] 1. An old English silver coin, equal to four pence. [1913 Webster] 2. Any small sum of money. [1913 Webster]