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trier
trierarch
trierarchy
Trieste
Trieste, Gulf of
trifecta
triffid
trifid
trifle
trifle with
trifling
trifocal
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triduum

tri·du·um [ tríjjoo əm, tríddyoo əm ] (plural tri·du·ums)


noun 
Definition:
 
prayer days before Roman Catholic feast: a period of three days of prayer before a Roman Catholic feast

[Early 18th century. < Latin< dies "day"]
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