I / interlūnĭum
noun

interlūnĭum

gen. interlūnĭi · gender neuter · decl. 2nd
interlunis
the new moon; time of new moon; interlunary interval
the new moon, time of new moon, interlunary interval, Plin. 18, 32, 75, § 324; 7, 5, 4, § 38. —In plur., Hor. C. 1, 25, 11.