English
interlunar
From inter- + lunar: compare Latin interlunis.
Proto-Indo-European *h₁én ‘in’
Proto-Indo-European *h₁entér ‘between’
Proto-Italic *n̥ter ‘between’
Latin inter ‘between’
English inter-
Proto-Indo-European *lewk- ‘bright’
…
Proto-Italic *louksnā ‘moon’
Latin lūna ‘moon’
Latin lūnāris ‘of or pertaining to the moon, lunar’
Middle English lunar ‘shaped like the crescent moon’
English lunar
Today it means
adj Of the four-day period between an old moon and a new moon, when the moon is not visible.
Language periods are conventional ranges, not dates for this word.
Etymograph / interlunar