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pentoxide [pentoxides]▼(oxide containing five oxygen atoms)noun[UK: pentˈɒksaɪd] [US: pentˈɑːksaɪd]
dinitrogen pentoxide▼(unstable binary compound N2O5)noun[UK: dˈɪnaɪtrədʒən pentˈɒksaɪd] [US: dˈɪnaɪtrədʒən pentˈɑːksaɪd]
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