πενθήμερος

A. of five days, ἀγών Sch. Pi. O. 5.13 ; κατὰ πενθήμερον for alternate periods of five days, X. HG 7.1.14 ; once in every five days, Arist. Ath. 30.4 ; also καθ’ ἑκάστην πενθήμερον SIG 364.9 (Ephesus, iii B. C.).