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Definition of: trilobite
(trī′lə·bīt) noun Paleontol.
Any of a subclass or group (Trilobita) of early Paleozoic marine arthropods related to the crustaceans, having a flattened body divided into a variable number of segments covered by a hard dorsal shield marked in three lobes. [<NL Trilobites <Gk. tri- three + lobos a lobe]
—tri′lo·bit′ic (-bit′ik) adjective
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