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WordNet-Online 
 Definitions from WordNet
Noun riser main has 1 sense 
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| Definitions from the WebRiser MainA riser main refers to a vertical pipe or conduit that allows the transportation of various substances, such as water, gas, or oil, from underground to the surface. Usage Examples:
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| riscuotendo rise rise and fall rise to power rise to the challenge rise up risen riser riser main riser pipe riser pipeline riserve rish rishi rishit risian risibility 
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