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permanent tooth
permanent wave
permanent way
permanganate
permanganic acid
permatemp
permeability
permeable
permeance
permease
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Permian
permissible
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permanent hardness
per·ma·nent hard·ness


noun 
Definition:
 
water hardness left after boiling: the hardness of water that is not removed after prolonged boiling
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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