The Collaborative International Dictionary of English v.0.48:

Tarot \Tar"ot\, n. [F.; cf. It. tarocco.]
   1. A game of cards; -- called also taroc. --Hoyle.
      [1913 Webster]

   2. any of a set of 22 playing cards which bear allegorical
      images representing various objects or influences
      affecting human life, and widely used in fortunetelling;
      they are also used as trumps in the game of taroc. Various
      images are used by different artists to represent the
      themes of each card.
      [PJC]

WordNet (r) 3.0 (2006):

tarot
    n 1: any of a set of (usually 72) cards that include 22 cards
         representing virtues and vices and death and fortune etc.;
         used by fortunetellers [syn: tarot card, tarot]