I.between two months: “lunā intermenstruā,” i. e. at the time of new moon, Plin. 18, 32, 75, § 322.—Subst.: intermenstrŭum , i. n. (sc. tempus), the new moon, time of new moon, Varr. R. R. 1, 37, 1; Cic. Rep. 1, 16, 25: “tempore intermenstrui,” Amm. 20, 3, 11.
inter-menstrŭus , a, um, adj.,