From cloud + seeding.
cloud seeding (uncountable)
- The act of firing munitions containing silver iodide at passing clouds to make them more likely to produce rain.
- 2008, Guinness World Records 2008
- In order to artificially increase the amount of rainfall over arid regions in China... ...fire munitions containing silver iodide particles at passing clouds...Pictured are cloud seeding aircraft bearing racks of silver iodide flares that are dropped into clouds as the aircraft flies through.