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pentaquine
pentastich
pentastome
Pentateuch
pentathlete
pentathlon
pentatomic
pentatonic scale
pentavalent
pentazocine
Pentecost
Pentecostal
Pentelic marble
pentene
penthouse
pentimento
Pentland Firth
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pentoxide
pent·ox·ide [ pen tók sd ] (plural pent·ox·ides)


noun 
Definition:
 
oxygen-containing element: a chemical element whose oxides contain five atoms of oxygen in each molecule
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