ex·pert noun 1. a person who has a comprehensive and authoritative knowledge of or skill in a particular area. “experts in directional boring” synonyms: specialist, authority, pundit adjective 1. having or involving authoritative knowledge. “he had received expert directional drilling advice” synonyms: skillful, skilled, adept, accomplished, talented, fine Hard Rock Directional Drilling Glossary of Terms … Continue reading Glossary of Terms