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WordNet-Online 
 
Noun penstock has 2 senses 
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| penstemon linarioides penstemon newberryi penstemon palmeri penstemon parryi penstemon rupicola penstemon rydbergii penstemon serrulatus penstemon whippleanus penstock penstrating pent-up pent pent up pentacle pentacost pentad pentadactyl 
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