An Etymological Dictionary of Astronomy and Astrophysics

In Old Iranian and Egyptian calendars and much later in the → French Republican Calendar, one of five (or six) days placed between the 30th of the last month and the first day of the new year to result in a fixed year of 365 (366) days every year; plural epagomenae. Same as → epagomenal day. See also → sansculottide.

Etymology (EN): From Gk. epagomenos “added,” from epagein “to add, to intercalate,” from → epi- “on” + agein “to bring, to lead,” → act.

Etymology (PE): Andargâh “intercalary,” literally “time between,” from andar “between, among,” → inter-, + gâh “time;” Mid.Pers. gâh; O.Pers. gāθu-; Av. gātav-, gātu- “place, throne, spot” (Skt. gátu- “going, motion; free space for moving; place of abode;” PIE *gwem- “to go, come”).
Tarufté “intercalary,” literally “stolen (day);” Mid.Pers. truftag, from taruftan “to steal,” traft “stolen;” Mod.Pers. Lârestâni dialect toftak “spy;” Av. tarəp- “to steal,” tarəfiiāt- “he would steal;” cf. Skt. tarp- “to steal, rob,” paśu.trp- “stealing cattle.”
Dozdidé “intercalary,” literally “stolen (day),” p.p. of dozdidan “to steal,” Mid.Pers. duz(d)itan, from duzd “thief,” from Av. duždāo- “miscreant, villain.”