The Collaborative International Dictionary of English v.0.48:

Dressing table \Dressing table\, n.
   a table, usually having a vertical back piece containing a
   mirror, at which a person may sit while dressing or applying
   makeup, and on which articles for the toilet stand. It often
   has drawers for toiletries, clothing, or accessories. It is
   also called a vanity or vanity table.
   [PJC]

WordNet (r) 3.0 (2006):

dressing table
    n 1: low table with mirror or mirrors where one sits while
         dressing or applying makeup [syn: dressing table,
         dresser, vanity, toilet table]