Anomalistic month

from WordNet (r) 3.0 (2006)

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

from 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.
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   {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]