지능이 매우 뛰어나거나 학구적인 연구와 생각에만 몰두하는 사람
An exceptionally intelligent person, often one who is intensely focused on intellectual or academic pursuits.
예문:
"The tech startup was founded by a group of young brainiacs from MIT."
"You don't have to be a brainiac to figure out how to operate this software."
"She was the resident brainiac of the family, always reading complex physics books for fun."