Definition of brainstormer in English:

brainstormer

noun

US
  • 1Depreciative, informal, rare US informal. A person who experiences brainstorms; an insane, mercurial, or unstable person; an inspired or eccentric thinker, an intellectual. Frequently depreciative. Now rare.

  • 2Originally US. A participant in a brainstorming session.

Origin

Early 20th century; earliest use found in The Chicago Tribune. From brainstorm + -er.

Pronunciation

brainstormer

/ˈbreɪnˌstɔːmə/