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trigonous
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trihalomethane
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trilobite
tri·lo·bite [ trlə bt ] (plural tri·lo·bites)


noun 
Definition:
 
extinct arthropod: an extinct Paleozoic ocean arthropod with a flat oval body and a dorsal exoskeleton divided into three vertical sections. Class Trilobita.
[Mid-19th century. < modern Latin Trilobites< Greek lobos "lobe"]

tri·lo·bit·ic [ trlə bíttik ] adjective
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