rainmaker Syllabification: (rain·mak·er)Pronunciation: /ˈrānˌmākər/Definition of rainmaker noun 1a person who attempts to cause rain to fall, either by rituals or by a scientific technique such as seeding clouds with crystals. 2North American informal a person who generates income for a business or organization by brokering deals or attracting clients or funds. Derivatives rainmakingPronunciation: /-ˌmākiNG/ noun rainmaker in other Oxford dictionaries Definition of rainmaker in the British & World English dictionary