brainiac
nounUK /ˈbreɪ.ni.æk/
US /ˈbreɪ.ni.æk/
A brainiac is a very smart person who loves to learn.
My little sister is a brainiac who finishes her homework before dinner.
OTHER MEANINGS
2. A person who knows a lot about computers and technology.
The office brainiac fixed the printer in two minutes.
3. A student who always gets top grades in school.
Everyone asked the class brainiac for help before the math test.
4. Someone who enjoys solving hard puzzles and problems.
Our team's brainiac figured out the tricky riddle first.