tricenary

Etymology 1
From, from +.

Adjective

 * 1)  Of or related to the number thirty.
 * 2)  Lasting thirty days.
 * 3) * 1655, T. Stanley, History of Philosophy, Vol. I, Ch. 3:
 * After 's time, the Civill year was Lunary... though diverse places of Greece,... did not for a long time after part with their tricenary months.

Etymology 2
From, from +.

Noun

 * , a set of 30 requiem masses.