triduum noun.
['trɪdjʊǝm, 'trʌɪ-] E18.[Latin, use as noun of adjective (sc. spatium space), formed as TRI- + dies day.]A period of three days;
esp. (
Roman Catholic Church) the last three days of Lent or the period from Maundy Thursday evening until the end of Holy Saturday. Also =
TRIDUO.
[TahlilGaran] English Dictionary ▲