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Webster's 1913 Dictionary

PENTOXIDE

Pen *tox "ide, n. Etym: [Penta- + oxide. ] (Chem. )

 

Defn: An oxide containing five atoms of oxygen in each molecule; as, phosphorus pentoxide, P2O5.

 

New American Oxford Dictionary

pentoxide

pent ox ide |pentˈäksīd pɛnˈtɑksaɪd | ▶noun Chemistry an oxide containing five atoms of oxygen in its molecule or empirical formula.

 

Oxford Dictionary

pentoxide

pentoxide |pɛnˈtɒksʌɪd | ▶noun Chemistry an oxide containing five atoms of oxygen in its molecule or empirical formula.