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trichotomy
trichroism
trichromat
trichromatic
trichuriasis
trick
trick or treat
trick out
trickery
trickle
trickle charger
trickle-down theory
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triclinic
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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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