noun
- a very intelligent person
Usage: informal
Examples
- She’s such a brainiac that she finished the math test in ten minutes.
- The brainiac in our class always knows the answer to every question.
- Don’t call me a brainiac just because I like to read.
- He may be a brainiac, but he struggles with social situations.
- The quiz show was full of brainiacs competing for the grand prize.
- My little sister is a real brainiac when it comes to science.