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formeston
formeston n.
Brit. 
/ˈfɔːmᵻst(ə)n/
, /ˈfɔːmᵻst(ə)n/U.S. /ˈfɔrməst(ə)n/
/ˈfɔrməst(ə)n/ΚΠ
1908 Practitioner Feb. 280 Combination [of pure eston] with formic acid produced a more energetic substance. This has been called ‘Formeston’, the acetic acid of one of the valencies of the alumina hydrate being replaced by formic acid.
1925 T. L. Stedman Pract. Med. Dict. Formeston, aluminum acetoformate, a dusting powder similar to eston and subeston.
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