interlunar

adjective
in·​ter·​lu·​nar | \ˌin-tər-ˈlü-nər \
variants: or less commonly interlunary \ˌin-​tər-​ˈlü-​nə-​rē \

Definition of interlunar 

: relating to the interval between old and new moon when the moon is invisible

First Known Use of interlunar

1598, in the meaning defined above

History and Etymology for interlunar

probably from Middle French interlunaire, from Latin interlunium interlunar period, from inter- + luna moon — more at lunar

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The first known use of interlunar was in 1598

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