- 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
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for trilobite
To the geologist man is just as much and just as little as a trilobite or a megatherium.Modern Skepticism
C. J. Ellicott
I will also exchange minerals for stalagmites, and a trilobite for a stalactite.
The appendages are not known, but the test is in some ways like that of a trilobite.The Appendages, Anatomy, and Relationships of Trilobites
Percy Edward Raymond
Trilobite—trīlo-bīte, not trĭlo-bīte nor trŏllo-bīte, as it is often called.Every-Day Errors of Speech
L. P. Meredith
One of the most abundant fossil animals in ancient rocks is called a trilobite.Earth and Sky Every Child Should Know
Julia Ellen Rogers
- 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
Word Origin and History for trilobite
Online Etymology Dictionary, © 2010 Douglas Harper
- 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.