Definition of Nerd

Noun: nerd nurd

An insignificant student who is ridiculed as being affected or boringly studious
- swot [Brit], grind, wonk [N. Amer], dweeb
An intelligent but single-minded expert in a particular technical field or profession
Someone considered boring because of their obsessive hobby or narrow solitary interests
- trainspotter [Brit], anorak [Brit]