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trigonometric function
trigonometry
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trihalomethane
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trillium

tril·li·um [ tríllee əm ] (plural tril·li·ums)


noun 
Definition:
 
plant with 3 petals: a plant with a cluster of three leaves at the top of the stem. Flowers: single, large, white, pink, or purple, three-petaled. Native to: North America, South Asia.

[Mid-19th century. < modern Latin]
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