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pyroarsenic
pyroarsenic adj. 
/ˌpʌɪrəʊˈɑːsn̩ɪk/,
Brit. /ˌpʌɪrəʊˈɑːs(ə)nɪk/
, /ˌpʌɪrəʊˈɑːs(ə)nɪk//ˌpʌɪrəʊˈɑːsn̩ɪk/U.S. /ˌpaɪroʊˈɑrs(ə)nɪk/
pyroarsenic acid an acid produced by the action of heat on arsenic acid.Formula: (HO)2AsO·O·AsO(OH)2./ˌpaɪroʊˈɑrs(ə)nɪk/ΚΠ
1874 T. E. Thorpe Man. Inorg. Chem. xiii. 393 Pyroarsenic acid, H4As2O7 is formed by heating the crystallized acid to 160°.
1954 Analyt. Chem. 26 86/2 The reaction of thorium nitrate to form gels with pyroarsenic acid.
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