Definitions

1. noun

a person, especially a man, who is enthusiastically and somewhat pedantically interested in a particular subject or activity, especially science, technology, or engineering.

“The boffin in the team was responsible for designing the new gadget.”

2. noun

a person who is excessively and annoyingly pedantic or precise.

“He’s a bit of a boffin when it comes to grammar and punctuation.”