consultant         
noun [ C ] uk/kənˈsʌl.tənt/ us/kənˈsʌl.tənt/
B2 顾问;咨询师
someone who advises people on a particular subject
  a management/financial/computer consultant 管理/财务/计算机顾问 
 a firm of public relations consultants 公关顾问公司 
  UK高级顾问医师;会诊医师;医学专家 
a  specialist  (= doctor with special training and knowledge in a particular area of medicine)
 - More examples
 - We ought to hire a public relations consultant to help improve our image.
 - The doctor gave him a referral to the consultant.
 - Eventually they found a consultant they felt they could do business with .
 - She set up in business as a management consultant.
 - She is a feng shui consultant.