ma·ven /ˈmeɪvən/ noun [countableC] American EnglishAmEINTELLIGENT someone who knows a lot about a particular subject 专家,内行food/fashion/sports etc maven A food maven could also be called a gourmet. 食品行家也可叫做美食家。
food/fashion/sports etc maven• Recipes will be judged on originality and compatibility with the wine by a panel of chefs and Bay Area food mavens.• Thus, the cash registers, not fashion mavens, choose the hues of the season.
From Longman Business Dictionary
mavenma·ven /ˈmeɪvən/ noun [countableC] American EnglishAmE someone who knows a lot about a particular subjectSYN EXPERTStockmarket mavens say such a pattern usually signals more gains ahead.