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proton
proton number
proton pump
proton pump inhibitor
proton synchrotron
protonema
protonics
protonotary
protoplanet
protoplasm
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protraction

pro·trac·tion [ prō trákshən, prə trákshən ] (plural pro·trac·tions)


noun 
Definition:
 
1. protracting of something: the act of protracting something

2. scale drawing: the act of drawing something such as a building or an area of land to scale, or a drawing of this kind

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