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plasma-arc machining
plasma cell
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plaster of Paris

plas·ter of Par·is


noun 
Definition:
 
white powder used for casting: a white powder, calcium sulfate, that when mixed with water forms a quick-hardening paste. It is used in the arts for sculpting and making casts, and in medicine for molding casts around broken limbs.

[Because it originated in Paris, France]
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