bifluoride

[bahy-floor-ahyd, -flawr-, -flohr-]

noun Chemistry.

an acid salt of hydrofluoric acid containing the group HF₂-, as ammonium bifluoride, NH₄HF_2.

Origin:
bi-¹ + fluoride

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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Bifluoride is always a great word to know.

So is polymer. Does it mean:

of or containing titanium, especially in the tetravalent state or three valence state

a compound of high molecular weight made by adding many smaller molecules or by condensation smaller molecules with the elimination of water or alcohol

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ammonium bifluoride

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bifluoride

bi·fluor·ide