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We have one entry that includes the term tetraboric.
tetraboric acid
noun: a dibasic acid H2B4O7 containing four atoms of boron in a molecule, formed by heating ordinary boric acid, and known especially in the form of its salts (as borax)
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- Before we went to her house, Hannah told us her aunt was a flibbertigibbet.


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Merriam-Webster unabridged