rainmaker

Someone or something that causes or attempts to cause rain to fall.

• By using a portable artificial "rainmaker" it is possible to obtain run-off data for rains of different amounts and intensities under a variety of conditions.
• Unlike summer, when scattered thunderstorms are the primary rainmaker, September precipitation becomes increasingly controlled by large but infrequent low pressure areas that develop near or migrate toward Colorado.

Someone or something that causes or attempts to cause rain to fall.; A medicine man, shaman, or the like, who seeks to induce rain through performing rituals, as in African or Native American cultures.

• If you want the Vegetation to appear you must have rain; and the rain-maker in almost all primitive tribes has been a most important personage.
• This same knowledge of botany coupled with a knowledge of the movements of travelling bird life may suggest the clue by which certain old rain-makers at times foretell rain and floods.

Someone or something that causes or attempts to cause rain to fall.; A person who seeks to induce rainfall through scientific methods, such as cloud seeding.

• Rainmakers consider seeding Bangkok sky as PM2.5 returns to ‘safe’ level [title] […] The Royal Rainmaking and Agricultural Aviation Department is preparing to seed clouds above Bangkok in an attempt to ease the capital’s smog problems.

A person having the ability to generate business, raise funds, or otherwise engineer success for a company, organization, etc.USfigurativelyinformal

• The law firm relied heavily on Charlotte as its main rainmaker to bring in new clients.

A batted ball that is hit very high into the air.informal

• The slugger is known for hitting rainmakers.