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tricyclic antidepressant drug
tridactyl
Trident
trident
tridental
Tridentine
tridimensional
tridosha
triduum
tried
tried and true
triene
triennia
triennial
triennium
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trier
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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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