(among American Indians) a medicine man who by various rituals and incantations seeks to cause rain.
a person who induces rainfall by using various scientific techniques, as the seeding of clouds with silver iodide crystals from an airplane.
Slang. an executive or lawyer with exceptional ability to attract clients, use political connections, increase profits, etc.: The president has several rainmakers among his advisers.

1765–75, Americanism; rain + maker

rainmaking, noun
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World English Dictionary
rainmaker (ˈreɪnˌmeɪkə)
1.  (among Native Americans) a professional practitioner of ritual incantations or other actions intended to cause rain to fall
2.  informal chiefly (US) an influential employee who creates a great deal of business or revenue for his or her firm

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Even in the unsentimental world of business, a rainmaker is someone who makes things work.
He rushed into print, filled the little cattle country paper with outbursts against the rainmaker and his promise.
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