interlunar definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
of the period of time each month when the moon cannot be seen because it is in or near conjunction with the sun
Origin: probably ; from Middle French interlunaire: see inter- and amp; lunar
interlunar definition by American Heritage Dictionary
Of or relating to the four-day period between the old and new moon when the moon is not visible.