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propellant
propellent
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propenoic acid
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propagator

prop·a·ga·tor [ próppə gàytər ] (plural prop·a·ga·tors)


noun 
Definition:
 
1. spreader of ideas: somebody who spreads ideas or beliefs widely

2. box for seeds or cuttings: a shallow box with a transparent cover used for germinating seeds or allowing cuttings to take root, especially one that can be heated

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