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Tridentine
tridimensional
tridosha
triduum
tried
tried and true
triene
triennia
triennial
triennium
Trier
trier
trierarch
trierarchy
Trieste
Trieste, Gulf of
trifecta
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tricuspid valve
tri·cus·pid valve (plural tri·cus·pid valves)


noun 
Definition:
 
heart valve: a heart valve consisting of three flaps that prevents blood from flowing back into the right atrium when the right ventricle contracts
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