The Collaborative International Dictionary of English v.0.48:

Anomalistic \A*nom`a*lis"tic\, Anomalistical
\A*nom`a*lis"tic*al\, a. [Cf. F. anomalistique.]
   1. Irregular; departing from common or established rules.
      [1913 Webster]

   2. (Astron.) Pertaining to the anomaly, or angular distance
      of a planet from its perihelion.
      [1913 Webster]

   Anomalistic month. See under Month.

   Anomalistic revolution, the period in which a planet or
      satellite goes through the complete cycles of its changes
      of anomaly, or from any point in its elliptic orbit to the
      same again.

   Anomalistic, or Periodical year. See under Year.
      [1913 Webster]

WordNet (r) 3.0 (2006):

anomalistic month
    n 1: period between successive perigees; approximately 27.5546
         days