General English

General Science

  • noun a person who specialises in a particular area of knowledge
  • noun an organism which only lives on one type of food or in a very restricted habitat


  • noun a person or company that deals with one particular type of product or one subject
  • noun a trader on the NYSE who deals in certain stocks for his own account, selling to or buying from brokers


  • noun an expert in a certain field of study


  • noun a player who is selected for his skill either as a batsman or as a bowler, rather than as an all-rounder
    Citation ‘England … were the bit-part players, the bowlers to supply the runs and, even by the start of play, all four specialists had conceded upwards of 100’ (Alan Lee, The Times 19 April 1994)

Information & Library Science

  • noun an expert in one particular area of knowledge or skill


  • noun a doctor who specialises in a particular branch of medicine