discarded

Concise Oxford English Dictionary © 2008 Oxford University Press:
discard

▶verb /dɪˈskɑːd/ get rid of (something) as no longer useful or desirable.

■ (in bridge, whist, and similar card games) play (a card that is neither of the suit led nor a trump), when one is unable to follow suit.

▶noun /ˈdɪskɑːd/ a discarded item, especially a card in bridge or whist.

– derivatives
discardable /dɪsˈkɑːdəb(ə)l/ adjective.

– origin C16: from dis- + card1.