What does "cloud seeding" mean?

The act of firing munitions containing silver iodide at passing clouds to make them more likely to produce rain.

What is a synonym for "cloud seeding"?

Common synonyms include: rainmaking.

noun

noun ·Rare ·Advanced level

Noun

1
The act of firing munitions containing silver iodide at passing clouds to make them more likely to produce rain. uncountable

From cloud + seeding.