playing card

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A card marked with its rank and suit and belonging to any of several decks used in playing various games.

from The Century Dictionary.

• noun One of a pack of cards used for playing games; especially, one of a set composed of fifty-two cards, of four suits—diamonds, hearts, spades, and clubs.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun One of usually 52 rectangular pieces of card used to play numerous games, featuring either one to 10 pips or a picture and belonging of one of four suits.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun one of a pack of cards that are used to play card games