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[pen-tok-sahyd] /pɛnˈtɒk saɪd/

noun, Chemistry.
an oxide containing five atoms of oxygen, as phosphorus pentoxide, P 2 O 5 .
an oxide of an element with five atoms of oxygen per molecule


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  • Pents

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  • Pent-up

    [pent-uhp] /ˈpɛntˈʌp/ adjective 1. confined; restrained; not vented or expressed; curbed: pent-up emotions; pent-up rage. adjective (pent up when postpositive) 1. not released; repressed: pent-up emotions 2. kept unwillingly: I’ve been pent up in this office for over a year

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