(comparative more stoneproof, superlative most stoneproof)
stone + -proof
"stoneproof." YourDictionary, n.d. Web. 19 September 2018. <http://www.yourdictionary.com/stoneproof>.
stoneproof. (n.d.). Retrieved September 19th, 2018, from http://www.yourdictionary.com/stoneproof
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