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1. (n.) trilobite
any marine arthropod of the extinct class Trilobita, from the Paleozoic Era, having a flattened oval body in three vertical segments.
Etymology: (1825–35; < NL Trilobites= Gk trílob(os) three-lobed (see tri -, lobe ) +-ītēs -ite1)
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| Definition of 'trilobite' |
Princeton's WordNet |
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1. (noun) trilobite
an extinct arthropod that was abundant in Paleozoic times; had an exoskeleton divided into three parts
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| Definition of 'trilobite' |
Webster Dictionary |
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1. (noun) trilobite
any one of numerous species of extinct arthropods belonging to the order Trilobita. Trilobites were very common in the Silurian and Devonian periods, but became extinct at the close of the Paleozoic. So named from the three lobes usually seen on each segment
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Definitions of trilobite 
