|intə(r)|lünə(r) also -)l|yü- adjective
also in·ter·lu·na·ry -nərē
Etymology: interlunar probably from Middle French interlunaire, from Latin interlunium interlunation (from inter- + luna moon) + Middle French -aire (from Latin -aris -ar); interlunary probably modification (influenced by English lunary ) of Middle French interlunaire — more at lunar
: relating to the interval between old and new moon when the moon is invisible
silent as the moon … hid in her vacant interlunar cave — John Milton