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ortho-salt
ortho-salt n. 
/ˈɔːθə(ʊ)sɔːlt/, /ˈɔrθoʊˌsɑlt/
Brit. /ˈɔːθə(ʊ)sɒlt/
, /ˈɔːθə(ʊ)sɒlt//ˈɔːθə(ʊ)sɔːlt/U.S. /ˈɔrθoʊˌsɔlt/
, /ˈɔrθoʊˌsɔlt//ˈɔrθoʊˌsɑlt/ΚΠ
1859 W. Odling in London, Edinb., & Dublin Philos. Mag. 4th Ser. 18 374 The following Table illustrates the relations of the meta- and ortho-salts.
1963 Jrnl. Electroanalytical Chem. 6 131 In both nitrate and chloride melts, sodium metaphosphate neutralizes in two successive steps to the pyro and ortho-salts respectively.
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