The Collaborative International Dictionary of English v.0.48:

Quarantine \Quar`an*tine"\, v. t. [imp. & p. p. Quarantined;
   p. pr. & vb. n. Quarantining.]
   To compel to remain at a distance, or in a given place,
   without intercourse, when suspected of having contagious
   disease; to put under, or in, quarantine.
   [1913 Webster]

WordNet (r) 3.0 (2006):

quarantined
    adj 1: under forced isolation especially for health reasons; "a
           quarantined animal"; "isolated patients" [syn:
           isolated, quarantined]