The Collaborative International Dictionary of English v.0.48:

Adulterine \A*dul"ter*ine\, a. [L. adulterinus, fr. adulter.]
   Proceeding from adulterous intercourse. Hence: Spurious;
   without the support of law; illegal.
   [1913 Webster]

         When any particular class of artificers or traders
         thought proper to act as a corporation without a
         charter, such were called adulterine guilds. --Adam
                                                  Smith.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Adulterine \A*dul"ter*ine\, n.
   An illegitimate child. [R.]
   [1913 Webster]

WordNet (r) 3.0 (2006):

adulterine
    adj 1: conceived in adultery