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Any of numerous extinct marine arthropods of the class Trilobita, of the Paleozoic Era, having a segmented body divided by grooves into three longitudinal lobes and found as fossils throughout the world.
[New Latin Trilobītēs, former class name, from Greek trilobos, three-lobed : tri-, tri- + lobos, lobe.]
tri′lo·bit′ic (-bĭt′ĭk) adj.
(Palaeontology) any extinct marine arthropod of the group Trilobita, abundant in Palaeozoic times, having a segmented exoskeleton divided into three parts
[C19: from New Latin Trilobītēs, from Greek trilobos having three lobes; see tri-, lobe]
any marine arthropod of the extinct class Trilobita, from the Paleozoic Era, having a flattened oval body in three vertical segments.
tri`lo•bit′ic (-ˈbɪt ɪk) adj.
Any of numerous extinct and mostly small arthropods that lived during the Paleozoic Era. Trilobites had a hard outer covering divided into three lengthwise and three widthwise sections. Horseshoe crabs are considered to be their closest living relatives.