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Hint: Question mark (?) is a wildcard. Question mark substitutes one character.
English
noun
:
polyphosphoric acid
1.
polyphosphoric acid
(substance)
a series of oxyacids of phosphorus
Broader (hypernym)
oxyacid
,
oxygen acid
Narrower (hyponym)
metaphosphoric acid
,
pyrophosphoric acid
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. English edition:
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