The Collaborative International Dictionary
Interlunary
Interlunar \In`ter*lu"nar\, Interlunary \In`ter*lu"na*ry\, a.
Belonging or pertaining to the time when the moon, at or near
its conjunction with the sun, is invisible.
--Milton.
Wiktionary
interlunary
a. (alternative form of interlunar English)