on the seventh day, recurring every seven days
on the seventh day, ἱδρώς Hp. Aph. 4.36; ἑ. πυρετός a fever recurring every seven days, Id. Epid. 1.24: ἑ. τραγῳδοί Luc. Hist.Conscr. 1: with a Verb, διεφθείροντο ἑβδομαῖοι Th. 2.49, cf. X. HG 5.3.19, Plu. Galb. 7; ἑ. ἡμέρα PSI 6.690 (i/ii A.D.).
2 seven days old
seven days old, τράγος Horap. 1.48.
II
ἑβδομ-αῖον, τό, monthly festival of Apollo, IG 2(2).1357 (iv B.C.), cf. ἑβδομαγέτης: pl., Schwyzer 687 B 4 (Chios, vii/vi B.C.), 726.6 (Milet., v B. C.).