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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.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.