[ trahy-luh-bahyt ]
/ ˈtraɪ ləˌbaɪt /


any marine arthropod of the extinct class Trilobita, from the Paleozoic Era, having a flattened, oval body varying in length from 1 inch (2.5 cm) or less to 2 feet (61 cm).

Origin of trilobite

1825–35; < New Latin Trilobites, equivalent to Greek trílob(os) three-lobed (see tri-, lobe) + -ītēs -ite1


tri·lo·bit·ic [trahy-luh-bit-ik] /ˌtraɪ ləˈbɪt ɪk/, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Examples from the Web for trilobite

British Dictionary definitions for trilobite

/ (ˈtraɪləˌbaɪt) /


any extinct marine arthropod of the group Trilobita, abundant in Palaeozoic times, having a segmented exoskeleton divided into three parts

Derived forms of trilobite

trilobitic (ˌtraɪləˈbɪtɪk), adjective

Word Origin for trilobite

C19: from New Latin Trilobītēs, from Greek trilobos having three lobes; see tri-, lobe
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for trilobite

[ trīlə-bīt′ ]

Any of numerous extinct and mostly small arthropods of the subphylum Trilobita that lived during the Paleozoic Era and are extremely common as fossils. Trilobites had a hard outer covering divided into three lengthwise and three widthwise sections. Their heads had two prominent compound eyes similar in structure to those of modern insects.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.