attainder
Concise Oxford English Dictionary © 2008 Oxford University Press:
attainder /əˈteɪndə/
▶noun historical the forfeiture of land and civil rights suffered as a consequence of a sentence of death for treason or felony.
– phrases
act (or bill) of attainder an item of legislation inflicting attainder without judicial process.
act (or bill) of attainder an item of legislation inflicting attainder without judicial process.
– origin ME: from Anglo-Norman Fr., var. of OFr. ateindre in the sense ‘convict, bring to justice’ (see attain).
'attainder' also found in these Oxford entries:

