| picofarad | (noun) a unit of capacitance equal to one trillionth of a farad | - |
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| picometer | (noun) a metric unit of length equal to one trillionth of a meter | Synonyms: micromicron, picometre |
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| picometre | (noun) a metric unit of length equal to one trillionth of a meter | Synonyms: micromicron, picometer |
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| picornavirus | (noun) a group of single-strand RNA viruses with a protein coat | - |
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| picosecond | (noun) one trillionth (10^-12) of a second; one thousandth of a nanosecond | - |
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| picot | (noun) an edging of small loops, as on lace or ribbon | - |
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| picovolt | (noun) a unit of potential equal to one trillionth of a volt | - |
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