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trickle-down theory
trickster
tricksy
tricky
triclad
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triclinium
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tricuspid valve
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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"]
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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