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penny whistle
penny-wise
pennycress
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pennyweight
pennywort
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penology
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Pension Benefit Guaranty Corporation
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penstock

pen·stock [ pén stòk ] (plural pen·stocks)


noun 
Definition:
 
water pipe: a sluice, channel, or pipe used to control or supply a flow of water to something such as a hydroelectric plant

[Early 17th century. <pen2 "enclosure"]
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