Source : Webster's Revised Unabridged Dictionary (1913)

Anomalous \A*nom"a*lous\, a. [L. anomalus, Gr. ? uneven,
   irregular; 'an priv. + ? even, ? same. See {Same}, and cf.
   {Abnormal}.]
   Deviating from a general rule, method, or analogy; abnormal;
   irregular; as, an anomalous proceeding.

Source : WordNet®

anomalous
     adj : deviating from the general or common order or type;
           "advanced forms of life may be anomalous in the
           universe"