rain·mak·er / ˈrānˌmākər/ • n. a person who attempts to cause rain to fall, either by rituals or by a scientific technique such as seeding clouds with crystals. ∎ inf. a person who is highly successful, esp. in business. ∎  a person who has influential business or political connections.DERIVATIVES: rain·mak·ing / -ˌmāking/ n.

rainmaker a person who attempts to cause rain to fall, either by rituals or by a scientific technique such as seeding clouds with crystals; in figurative use, a person who is highly successful, especially in business.