highly trained or skilled
knowledgeable, proficient
Cases of word usage
1) an expert in, student of, archaeology (archaeologist)
2) an expert in, student of, astronomy (astronomer)
3) a student of, expert in, biology (biologist)
4) a student of, expert in, botany (botanist)
5) an expert in chemistry (chemist)
6) a person who gives expert advice (e.g. in medicine, business) (consultant)
7) an expert in, student of, economics or political economy (economist)
8) a student of, expert in, etymology (etymologist)
9) (a particular) expert knowledge and skill (expertise)
10) an expert in finance (financier)