From BiblePortal Wikipedia

Webster's Dictionary [1]

(pl.) of Die

Cyclopedia of Biblical, Theological and Ecclesiastical Literature [2]

used, like the English "day," to designate a festival:

(1) Dies Adoratus, Good Friday.

(2) Dies Aegyptiaci, certain "unlucky days" supposed to have been discovered by the ancient Egyptians from astrological calculations, and marked in the calendars, but their observance was forbidden.

(3) Dies Boni, used to designate festivals.

(4) Dies Consecrati, the four days at Christmas observed as festival days, on which no courts were to be held.

(5) Dies Magnus Felicissimus used for Easter-day; Dies Magnus, also used for the Last day.

(6) Dies Natalis, birthday.

(7) Dies Neophytorum, the eight days of special observance, from Easter- day to its octave, during which the newly baptized wore white garments.

(8) Dies Palmaraum (or, In Ramis Palmarum), Palm Sunday.

(9) Dies Sancti, the forty days of Lent.

(10) Dies Scrutinii, the days on which candidates for. baptism were examined, especially Wednesday in the fourth week of Lent.

(11) Dies Solis, Dies Lunae. (See Week).

(12) Dies Tinearum or Murium, certain days when ceremonies were performed to avert the ravages of moths or mice.

(13) Dies Viridium, Thursday of holy week in some ancient German calendars; "Green Thursday" in modern German ones. (See Maunday Thursday).

(14) Dies Votorum,. a wedding-day among the Lombards.