interlūnĭum, ĭi, n. [interlunis],
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.
interlūnium ī, n interlunis, the time of new moon.—Plur ., H. ...
An Elementary Latin Dictionary