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Apparently, there’s an obsolete English word “smitham” that means (or meant) “small lumps of ore random people found.” They were exempt from taxation by English nobility so large mine owners started breaking up large chunks into “smitham” to avoid taxation. Apparently, the Duke of Devonshire put a stop to that in 1760 and the word fell out of use.
So, I think rhythm still counts as weird. Noah Webster was 2 years old in 1760 and the modern Merriam-Webster dictionary doesn’t have it.