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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.
(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]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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|Noun||1.||trilobite - an extinct arthropod that was abundant in Paleozoic times; had an exoskeleton divided into three parts|
arthropod - invertebrate having jointed limbs and a segmented body with an exoskeleton made of chitin
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