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anomalistic monthThe time interval of 27.554 55 days, on average, between two successive passages of the Moon through the perigee of its orbit.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006
anomalistic month[ə¦näm·ə¦lis·tik ′mənth]
The average period of revolution of the moon from perigee to perigee, a period of 27 days 13 hours 18 minutes 33.2 seconds.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.